I tried all of the chars, and I found that warrior/rouge (if there's no lag) pwns every char EXCEPT warrior/warlock and sometimes warrior/cleric. I have used warrior/rouge most of the time, and I made a skillbar which was pretty easy to handle. Yeah, it needs a f*ckin good set, good weps, specially shield and dagger, and a lot of sp, but if you can get them, it's awesome in pvp. I had no problems killing all chinese characters, and against eu ones, well, you have to concentrate and think forward, what weapon should you change to next. If you do it badly, you die by every char, but if you are experienced, easy to pwn all of them.
(You use warrior 1h to dull, sprint assult to stun, then you use dagger ***** to kill. If it doesn't work, you go 2h and try to kd, if it works, dagger again and use the 3hit combo, which hits a lot when enemy is knocked down. If it fails, then repeat from the beginning, no matter how strong is the opponent character, one crit and it'll die.
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