Na I would say rets, (not the other specs as much) then DKs, then warriors. Monks on the other hand…have never had a problem with getting too many nerfs, they are too weak to even bother with. They need buffs or at least a change to gameplay to make them more enjoyable. Still by far the least played class in the game.
They should have come in as a hero class, not just a class. Illidan Hero, Arthas Hero. Monks had none. But as it goes, pallies get nerfed the most and monks get buffed the least.