blizzard's gm & game designers whom all plays mages think that after you buff warrior over the top, then nerf it back to the ground, their tears would be sweeter than honey.
they need it(the tears) for afternoon teas

dk pretty much next on the hit list.

best re-roll priest, you can spec holy and ninja dps gear, claim shadow IS your main spec, you just roll holy for the quick lfg queue.

another safe bet is rogues
if you can beat anyone in arena, just cloak of shadow, walk to the far end corner, afk and hope your opponent team nerdrage leave arena match, or time runs out for a tie game.