No matter what Plight tells you it's not a good choice for PvP, highly resisted and zero mez makes it a poor man's Broadsword.
World of Jackcraft.
But it has so much style!
And BS is the most boring set IN THE WORLD! 
I have no idea... they keep running away when they see me. Is it my deoderant or something? 
Disclaimer: The above may be humerous, or at least may be an attempt at humour. Try reading it that way.
Posts are OOC unless noted to be IC, or in an IC thread.
For PvP
Spines - Ranged attacks and AoEs
Martial Arts - Lots of stuns and disorients
Dark Melee - Neg damage not as much resistance, acc debuff on attacks, touch of fear 
Broadsword - i'm still not sure, head splitter for delivering lots of damage in one hit but quite a slow set. probably great 1 v 1 set or for finishing off held victims.
Claws - Damage is too low and lethal type is resisted
Katana - Better damage than claws but still not great, -DEF on attacks won't be massivley useful as they don't last long and fights generally don't last too long.
It's not bad for PVP, but if you're starting from scratch it's certainly not the best available.
The one good thing is the knockdown/back powers...although not much use against most scrappers or tanks. Does make a very effective squishy killer though 
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Does make a very effective squishy killer though
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Except any prepared squishie is going to have protection from that in Hover or even Acrobatics, if a squishie without knockback protection stays around after the first hit from a Katana without knockback protection then they really deserve to bite the dust.
Broadsword like I said does it all better than Katana, Claws even does it better than Katana, with ranged knockback, and more of it.
World of Jackcraft.
The damage from Katana is pretty nice, with the final attack I can almost 1 shot any squishy, a quick follow up with almost any other attacks means death.
Is Katana/Regen any good pvp-wise just thinking since theres so much smash/lethal resistance