After seeing how Vamps handle in PvP, I think that the entire concept may need reworked. I don't think you should basically have to go Vamp to be highly competitive. Maybe the Vamp/WW should be more of for fun only kinda thing that gives you some sort of single target drain life thing once a target is below 15%, so you can suck their blood when they're almost defeated. Or, you can do a "suck blood" type attack from stealth that stuns target, drains health and adds a power buff for 10-15 seconds.
I don't care if ppl are vamps and ww's... I just don't want to hear so many ppl saying "It sucks that I had to go vamp to be competitive in pvp".
That's just my opinion tho. Regardless of how ridiculous some vamp abilities are, I'll never give in and become one. Because well, they're lame af.