[Pudge]

Bard can be really good in group PvP if you are ontop of your shit. You're basically unkillable and are massive help to your group. But you have to actually be into playing a bard.

Ranger could be fun in velious with trueshot. Lasts 2 minutes so that's a good long time. Don't know how good it will actually be though.. velious ain't out yet. Rangers don't do the best dps but have good utility. Also, snare very rarely lands in PvP (2% it lands) so you won't be snaring many pop to death.

Wizard always good for exploding ppl. Once you get epic you're even a little beefy. They're good if you can hold back and position yourself well.

Enchanter you won't get many kills with your pet. People will either dispel your charm, or fear the mob. Most pop will try and dispel. If you take the time to bury your charm then they might get wrecked in a 1v1 scenario.

SK - I play SK and I don't fear many classes. Not the best DPS but beefy with utility.

Rogue - you won't be sneaking up on people hidden. Everyone has see invis. But if you do run up on someone they will get HURT. A good rogue in PvP will get many killshots. Rogue are extremely powerful because while their DPS is phenomenal, they're still a melee so they get decent gear and hp. Rogues don't get focused first usually, which gives you time to DPS.