In my experience the brewmaster only makes use of drinking contest in two models, tops. There's no way for him to spread poison effectively around, you need to be very careful with him like you would on an assasin master. Choose one or two extremly dangerous models and go to town with them, because unless the enemy crew is full of low willpower models (ulix pigs, or some resurrectionist crews) the drinking contest aura is laughably small and inconsecuential, and the brew has nothing aside from that in the way of defenses. Not only that, but you need the rest of your crew to be useful outside the brewmaster or else bogging two models won't matter at all, and you're already spending 8 ss or more in trixiebelle, always, wich doesn't do a lot of damage, and probably a performer.
Maybe I'm just bad at this but, despite being my favorite master, I find his crewmaking much more restrictive that some other masters.
I have used him that way and it's pretty good. Althoguht I always have a hard time against summoning crews when I go that way.
I would also say that his upgrades are not... very good... like at all. Only Binge and I don't see that upgrade as powerful as other people do. Thinks like "The Good Stuff" shouldn't exist. XD