Every time I play Brewmaster, something new bugs me aside of the lack of real defensive cds. For me it's like there are a lot of things missing in this spec ( maybe I still suck at it ). One of the things I've noticed while tanking is that brewmasters don't have that consistent aoe damage to get aggro of adds, and this is the reason I choose RJW all the time. Breath of fire has a long CD while it's one hit aoe, same with keg smash. Also, you'll be using keg smash on cd since it reduces CDs of brews, so it's not an option really (even with the artifact that resets BoF, it doesn't count).
Here are what the other tanks have(I have played all of them after pre-patch to decide which class to go) :
1- Paladin = concentration, AS, hammers
2- DK = death and decay, 2xblood boil
3- Druid = swipe (no cd), Thrash
4- Warrior = Thunder clap, Revenge
5- DH = immolation aura, their jump skill does aoe damage.
Do you have the same problem or not?