Arbegla

And some of them are affected by damage buffs, meaning a brute, and full fury, at level 1, can one shot a +4 boss with a baseball bat, assuming he hits. Its kinda insane.

So, assuming a bug doesn't cut your duration, you can keep it double stacked. Ok, thats fair enough, but AM isn't affected by said bug, so its easier to keep double, and even triple stacked.
Acid mortar double stacked is 40% (20% each) FR single stacked is 30%. So double stacked AM > single stacked FR. Now, to double stacked FR you need to lower its base recharge of 60seconds, to below 30 seconds, and to perma a double stacked FR you need to cut its recharge down to 10 seconds. Which is pretty hard to do. (even at 240 global recharge, with a t4 spiritual alpha boost, and the t4 ageless your only at 13 seconds, which due to casting time your looking at about 1.5 FRs perma. If the duration holds true, you can effectively have 3 stacks for about 15 seconds, then 2 perma, but we've already said that bug is annoying, and happens often, cutting your duration by quite a bit.

Double stacked FR is about 60% -res, which you would need to triple stack AM to match, but its pretty easy to do that, due to the recharge time of 90 seconds, and duration of 60. You'd only need about a recharge time of below 30 seconds to perma double stack, and about 20 seconds to have a triple stack up. Using the same above situation (t4 spiritual, t4 ageless, 240% global recharge combined) your looking at 19.4 recharge, which due to casting time, and the debuff duration lasting on the last shell hitting, you've got a triple stack, and about 10 seconds of a quad stack (again, due to shell duration)

The real winner is how often you can keep the Achilles Heel debuff active, due to that adding a pretty solid -20% resistance, for pretty cheap. You've already said that AM does it better, due to it not being limited by the 10 sec cooldown that FR is.
So your basing all your -regen on your pet? While it is true that the Assault bot packs some pretty hefty -regen, according to Red Tomax, it would need to use either the dual plasma, or single plasma blast every 30 seconds in order to keep up the debuff, (the dual plasma debuff lasts 30 seconds, recharges in 25, the single plasma also lasts 30 seconds, recharges in 4 seconds) Against multiple targets, you'll have very unreliable -regen, but against a hard single target, its very useful.

Poison trap is AoE, and the debuff is easily perma, plus its -1000%, so even against AVs it will floor their regen completely. Makes it much easier to lock down an entire groups regen, then a hard single target.

I'll give you nado, and LS but ONLY against targets with very HIGH knockback resistance. Both LS and Nado do pretty massive KB, and both of those powers cause Fear. Now i'm not sure if its the 'stay still and cower' fear, or the 'run like an idiot' fear, but that, plus the KB makes it very hard to get the most out of Nado and LS on multiple targets. Against a hard, stationary target, like say a Rikti Pylon, you'll get the best chance of doing all of the damage, and it can be pretty massive.

Caltrops may cause some fear (the running away kind) but it does deal some pretty hefty damage, especially when you consider you can triple and quad stack it pretty easily.
I'll give you hard, stationary targets that are immune to KB. In that case, /storm will most likely out damage /traps. But against groups, with limited protection to KB, /traps will come out ahead, due to being able to control groups better, and have easier to manage high damage attacks (trip mine, caltrops, damage procs etc)

Plus the cost weighs pretty heavily too, with much more invested in /storm you can do more damage then /traps, but the difference may not actually be worth the additional cost.

You also have to factor in that some Mobs don't actually deal the damage they have resistance to, and both -resistance and -dmg effectively stack on each other, so if an enemy has 20% lethal resistance, but deals cold damage and has 0% cold resistance, and say you debuff them by -20% damage, they will deal about 16% less lethal damage, but 20% less cold damage..

Now if you lower thier resistance, then lower their damage, you can effectively increase your -dmg by your -resistance, and cause them to do even less damage.

Quick update: I just tested this on the test server, and the proc works in all targets within range of the triage beacon. With enough recharge, you can have multiple beacons out, procing multiple heals. I need to do a more accurate look of the combat logs to see if the +end proc is also AoE, but so far, it seems to very much be a valuable enhancement slot.

Martial Arts, has a base 1.05x Acc bonus, which is easily made up with set bonuses (even in PvP)

Kinetic Melee has Siphon Power, can still be up pretty often (especually with CS crittting) and CS has much higher base acc then any other MA attack (CS has 1.20x acc, where MA has 1.05x acc)

Comparatively, kinetic melee > martial arts, even for lol PvP and even more lol fite club.

Your also looking at the HP at level 1.. You really want to compare the HP at level 50 (and the cap)

Without even looking in game, i can provide those numbers for you. Behold, the wonder of Paragonwiki.com:

http://paragonwiki.com/wiki/Hit_Points

Looks like, outta the heroes ATs blasters are 3rd, behind scrappers, but share the same HP cap as defenders and controllers. Scrappers and the Kheldians have different HP bases, but share the same HP cap, and tankers have the highest base out of all the ATs (even villains) and also have the highest cap.

Outta the villains, Mms are still the lowest, with dominators being about 200hp better, and corruptors and the VEATs being just slightly more durable (HP wise) then dominators. Stalkers are on par with blasters for HP (both with base, and caps) and brutes have the second highest HP out of all the ATs (even heroes) and the second highest cap.

I've managed this on my bot/traps MM.. granted i used Lore pets, but still.. i wasn't really in any serious danger. I only died once, used minimal inspirations and my death was mainly caused by my kiddo yanking my arm away from my mouse at just the wrong time.