I find it to be fine, threat is of no problem for me, 1 Keg Smash pretty much picks up all the mobs you'd ever want. You have an 8 sec CD AOE taunt, Drunken Haze that generates quite a bit of threat, and SCK which easily grabs up all the mobs you'd ever want. I'm hovering between 30-45k DPS on single target (bosses for the most part) and depending on the pull, I've been up to 300k AOE DPS in Scholo and Jade Serpent Temple HC.
Mitigation... well, for the most part there is no problem, I haven't really got a comparison from my healers, but what it looks like is that I spike and drop about the same as our DK tank (458 ilvl, just as me) some packs I take almost no damage at all, even while focusing only on DPS (BoF, SCK and KS on CD), while on other packs I can drop like a sack of flour with all my Chi focused on tanking (healer needing to spamheal me), this usually only happens when pulling 2-3 packs though, last pack with the cats in Mogu'shan is pretty hardcore though.
I run with 4800-something expertise, 2400 hit (hit and expertise hard cap for heroics), about 12% haste, really low mastery (4.4% or so) and 21% crit, no dodge and no parry rating.
http://eu.battle.net/wow/en/characte...edryn/advanced is my monk.
Edit: 334k hp right now as windwalker, but I have around 385k as brewmaster.