I guess you missed the part where the Devs said they would be throwing PVP buffs at monks. And they needed way more pvp buffs than pve buffs. Monk tanks are alright right now sure they have some holes in their spec but they are far from being bad. Mistweavers i can tell you from exeperience are not in a bad place right now, sure we're behind the pack for the most part be we are far from "bad". Windwalkers have steady dps and also are no where near bad.
Brewmasters are perhaps the worse pvp tanks right now. Mistweavers are the worse or tied with priests as the worse healers in arena, there is usually one per rbg group due to the fact that they can throw out crazy aoe heals. Windwalker monks, the least represented dps in arenas right now. No one past 1200 rating takes a WW monk into an rbg. I can tell you how it feels to be stunned as a monk....the same exact feeling it feels to be stunned as any other class.