1vs1 PvP:
WA is good, if you use the right skills (read, fast skills), else you won't do anything.
FB debuffs in 1vs1 PvP sucks and is kinda unfair, their skills are kinda mid-high casting, so it sucks IMO.
BL is good too, if you use the right skills (depends on the opponent, sure you won't use speed combo on a high def char), but you should have crit dmg/rate items, else...
Massive PvP (TG, War zones):
WA sucks if there are massive ppl around him... Why? Slow skills, when he starts to cast 1 skill, he could be already dead in this time.
FB rocks in massive PvP, since they have massive root and debuffs, you'd own them easily.
BL a lil bit better than WA, but still sucky sucky xD
IMO ...