I did the warlock team and they pwd the lower 60 dungeons. I did the shaman team and they rocked too. I've just started an hunter team and it's still very early but the level 14 hunters take down level 21 crawlers without much effort, I'm an old pro now so they seem to be leveling faster than anything else I've done so far, when you take down +7 over your level you get nice points even if you are on a team.