Hopeling

You've got 5% more ranged and AoE defense than you need. Dropping that will probably free up a lot of space in your build. If you find that you need padding against defense debuffs, use purple inspirations; 5% won't save you from much anyway with only 42% defense debuff resistance.

Active Defense might want some recharge slotting; you're relying heavily on Hasten's recharge to bring it up in time, but your Hasten has a downtime of over a minute. I'm bad at the exact math on partial-uptime-Hasten, but there might be periods where Active Defense falls off which will be instant death in a lot of situations. The power only costs 10 endurance every ~100 seconds. If that were a toggle, it would cost 0.1 end/s, slightly more than Combat Jumping, so slotting it for endurance is much less important than making sure it's up all the time.

The Chance for +Recharge proc is only really worth it in AoE powers that fire often, the #1 example being Foot Stomp. Disembowel only gives it one chance to proc, and Shield Charge recharges slowly, so neither of those are very good places for it.

Slice, Whirling Sword, Disembowel, and Headsplitter are pretty underslotted IMO. Parry should be slotted as an attack, at minimum it needs good accuracy because it doesn't give you the buff when it misses. You have enough melee defense elsewhere that Parry doesn't need any defense slotting to softcap you.

Battle Agility is way over the ED-cap for defense, Deflection is way under it. You have status protection from Active Defense already, so you don't need the Steadfast KB protection nor the Impervious Skin unique in Tough. Use those slots for +resist and +end reduction instead, Tough is a good power. The Aegis unique in Deflection is also rather superfluous.

The order in which you take powers puzzles me, although that only matters when you exemplar down.

Do you have a specific goal with this build? Soloing AVs, farming, general team play, something else? That will make a lot of difference in the kind of advice you get.

Cloaking Device counts its entire bonus into the summary, but only half applies out of stealth, so your actual numbers will be 5.91% less than the ones Mids is showing. This means everything except ranged defense is actually pretty far away from the softcap.

You're not softcapped, and your attacks are very underslotted (especially for accuracy). I'm not certain what your goal is with this build, but it might need to go back to the drawing board.

The most interesting part about this (to me) is what is going to happen to all the characters with fitness already? Will they be replaced by a new fitness pool with different nifty powers? Or a respec would fix the issue, of course.

The Hami's are just to save a slot or two while retaining high end reduction. It would probably be smarter to swap the slotting on Maneuvers and Heightened Senses there, since Maneuvers is more expensive.

I actually avoided LotG +7.5s because the OPs original build doesn't include them, and I wanted to avoid adding TOO much expense to the build (the Kinetic Combats do a lot of that already). However, Broadsword does like recharge. With LotG's it might look more like this:

To keep Parry up constantly, you'll be using it a lot, so it should be slotted as an attack (it certainly at least needs some accuracy). You could get some ranged/energy/negative defense with Mako's Bite, or smashing/lethal defense with a Kinetic Combat.

Kinetic Crash: Recharge/Endurance is another good, cheap enhancement that can go in your SS attacks.

Regarding squishiness, I don't see a lot that you can improve on. Purple and green inspirations are your best friends, but you probably know that already. (Red inspirations are relatively less valuable since you'll already be running over 200% +damage from Fury, Rage, and enhancements, so feel free to combine them to defensive ones.) When possible, try to stick to enemy groups that do primarily S/L damage.

What difficulty do you run at, and are you talking solo or on teams?

A level 50 AV has, I believe, 85% resistance to regen debuffs, so the -250% becomes -37.5%. A level 50 AV also regenerates a little over 100 hp/sec. Since Envenomed Dagger lasts 10 seconds, that's more than 375 hp not regenerated, which is just as good as dealing that much damage. Add the 160 damage done by the power itself, and you have an attack that does almost 500 damage with a 1.00s animation time. If you have 3 people keeping the debuff up, you can negate the AV's regen completely, although more debuffs beyond that won't do anything.

If you use a weapon set, the redraw will make using Envenomed Dagger less efficient, but probably still better than using one of your normal attacks. I don't know whether or not the debuff will stack from the same caster (probably not), so using it more than once every 10 seconds is unnecessary.

Okay, assuming I haven't made mistakes in my spreadsheet...

Just directly comparing the DPA of the attacks of the same cooldowns (pulverize - hack, jawbreaker - disembowel, etc), Brute WM attacks roughly break even with Scrapper BS attacks with 90% Fury and 1 enemy fueling AAO. Less Fury or more enemies will favor the scrapper. The Scrapper will also get more from Build Up and Shield Charge.

War Mace has better AoE attacks because Shatter and Crowd Control are wider than their counterparts, but I don't think that'll make up for the difference in raw damage. The only real advantage I'd say WM has is its KD/stun control, and having an extra strong ST attack (Clobber) instead of a low-damage defensive attack (Parry).

So I'd say Broadsword is going to be stronger (which is actually opposite what my first guess was). As mentioned, Parry will also make leveling easier.

Edit: I should add the caveat that although I've played both BS/ and /SD a lot, I haven't played them together, and I've never had a WM/.

Slotting a complete set will often get you values comparable to frankenslotting anyway, but sometimes frankenslotting is still very useful. I find it best when mixing low-level sets while leveling, and for powers where you're trying to enhance more than one thing. For example, making Siphon Life good as both an attack and a heal.

2 common IOs will get you almost the same resist value, but 3 slots lets you get a hefty fire/cold defense bonus by slotting an Aegis set.

If you're still leveling the character, though, 2 slots is plenty, partly because finding low-level Aegis sets might be difficult and expensive, and partly because you can probably use the slots elsewhere.

The main thing I'd change about the build you posted is that Hack and especially Parry are underslotted.

In Hack, I'd trade the Lysosome for a Mako's acc/dam/end/rech. Your attacks are already plenty accurate, an extra 2% defense debuff isn't necessary (and wouldn't do much even if you needed it).
I'd pull two slots from Blazing Aura and frankenslot it with two dam/end and two acc/dam/end enhancements. Put one of those slots in Parry and one in Weave.
The Membrane in Build Up isn't necessary, a plain recharge IO will bring the power up faster and be much cheaper.

I'd make minor changes to some other slotting as well. This build brings you down to 40% lethal and 42% melee defense. I know it's not soft-capped, but Parry is easy to double-stack when you need the extra defense.
Hero Plan by Mids' Hero Designer 1.707
http://www.cohplanner.com/

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Joan of Arkansas 6_7_10: Level 50 Magic Scrapper
Primary Power Set: Broad Sword
Secondary Power Set: Fiery Aura
Power Pool: Fitness
Power Pool: Fighting
Power Pool: Leaping
Ancillary Pool: Blaze Mastery

Hero Profile:
Level 1: Hack -- KntkC'bat-Acc/Dmg(A), KntkC'bat-Dmg/EndRdx(23), KntkC'bat-Dmg/Rchg(23), KntkC'bat-Dmg/EndRdx/Rchg(25), Mako-Acc/Dmg/EndRdx/Rchg(25)
Level 1: Fire Shield -- RctvArm-ResDam/EndRdx(A), RctvArm-ResDam(5), RctvArm-ResDam/EndRdx/Rchg(9), RctvArm-ResDam/Rchg(46)
Level 2: Slice -- Oblit-Dmg(A), Oblit-Acc/Rchg(3), Oblit-Dmg/Rchg(3), Oblit-%Dam(9), Oblit-Acc/Dmg/Rchg(15), Oblit-Acc/Dmg/EndRdx/Rchg(17)
Level 4: Healing Flames -- Dct'dW-Heal/EndRdx(A), Dct'dW-Heal(5), Dct'dW-Heal/Rchg(7), Dct'dW-Heal/EndRdx/Rchg(15), Dct'dW-Rchg(36)
Level 6: Build Up -- RechRdx-I(A), RechRdx-I(7)
Level 8: Parry -- LkGmblr-Rchg+(A), Mako-Acc/Dmg(13), C'ngImp-Acc/Dmg(17), Dmg-I(29)
Level 10: Blazing Aura -- M'Strk-Dmg/EndRdx(A), M'Strk-Acc/Dmg/EndRdx(11), Sciroc-Dmg/EndRdx(11), Sciroc-Acc/Dmg/EndRdx(13)
Level 12: Hurdle -- Jump-I(A)
Level 14: Health -- Mrcl-Rcvry+(A), Numna-Regen/Rcvry+(43)
Level 16: Plasma Shield -- S'fstPrt-ResDam/Def+(A), RctvArm-ResDam/EndRdx(19), RctvArm-ResDam/EndRdx/Rchg(37), RctvArm-ResDam(37)
Level 18: Whirling Sword -- Oblit-Dmg(A), Oblit-Acc/Rchg(19), Oblit-Dmg/Rchg(36), Oblit-Acc/Dmg/Rchg(40), Oblit-Acc/Dmg/EndRdx/Rchg(40), Oblit-%Dam(43)
Level 20: Stamina -- EndMod-I(A), P'Shift-End%(21), P'Shift-EndMod(21)
Level 22: Consume -- Efficacy-EndMod/Acc(A), Efficacy-Acc/Rchg(39), Efficacy-EndMod/Acc/Rchg(39), Efficacy-EndMod/Rchg(40)
Level 24: Boxing -- Acc-I(A)
Level 26: Disembowel -- Mako-Acc/Dmg(A), Mako-Dmg/EndRdx(27), Mako-Dmg/Rchg(27), Mako-Acc/EndRdx/Rchg(29), Mako-Acc/Dmg/EndRdx/Rchg(31), Mako-Dam%(31)
Level 28: Combat Jumping -- LkGmblr-Rchg+(A), Krma-ResKB(39), Ksmt-ToHit+(43)
Level 30: Tough -- RctvArm-ResDam/EndRdx(A), RctvArm-EndRdx(31), RctvArm-ResDam(33), RctvArm-ResDam/EndRdx/Rchg(33)
Level 32: Head Splitter -- Oblit-Dmg(A), Oblit-Acc/Rchg(33), Oblit-Dmg/Rchg(34), Oblit-Acc/Dmg/Rchg(34), Oblit-Acc/Dmg/EndRdx/Rchg(34), Oblit-%Dam(37)
Level 35: Fiery Embrace -- RechRdx-I(A), RechRdx-I(36)
Level 38: Rise of the Phoenix -- Heal-I(A)
Level 41: Char -- BasGaze-Acc/Rchg(A), BasGaze-Acc/Hold(42), BasGaze-Rchg/Hold(42), BasGaze-Acc/EndRdx/Rchg/Hold(42)
Level 44: Fire Blast -- Thundr-Acc/Dmg(A), Thundr-Dmg/EndRdx(45), Thundr-Dmg/Rchg(45), Thundr-Acc/Dmg/Rchg(45), Thundr-Acc/Dmg/EndRdx(46), Thundr-Dmg/EndRdx/Rchg(46)
Level 47: Fire Ball -- Posi-Dmg/Rchg(A), Posi-Dmg/EndRdx(48), Posi-Dmg/Rng(48), Posi-Acc/Dmg/EndRdx(48), Posi-Dam%(50)
Level 49: Weave -- RedFtn-Def/EndRdx(A), LkGmblr-Def/EndRdx(50), LkGmblr-Rchg+(50)
------------
Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- Empty(A)
Level 1: Critical Hit
Level 4: Ninja Run

My two cents on this has long been that the flight speed cap should be raised, but the base fly speed should not. That way, the people who care about faster fly speed could have it, but it would cost them a couple slots. It would also make my GvE jetpack "afterburners" useful

It seems to me the Force Feedback proc would be better in Thunder Strike, since you can use that a lot more often. I haven't tried it with TS specifically, but it works great in Tremor and Foot Stomp.

I'm working on a Fire/Shield myself, currently at 37, and all of the above advice is very sound. One thing I find helps is to always have a few purple inspirations on hand, whether by purchasing them from contacts or combining other inspirations. With the defense you already have from your secondary, it only takes 1-2 small purples to cap your defense, at which point you become very very hard to kill. I'm soloing on +2/x4 without trouble, thanks to using purple inspirations when I can't just blow the group away with Shield Charge.