Brew right in the beta even with the tier set is the weakest tank by far in raid and almost unplayable in high keys, and brew besides the odd one season where guard worked for your entire arena team has never done well in pvp.
Right now brew is not staggering bleeds, it will cut your hp down just a fast as if you where a dps. Brew can not withstand magic damage either. We are seeing in m+ you pull a few caster adds and brew drops just as fast a dps.
Blizzard did say they are looking into it as the HP buff that went out has not made brew tanky like hoped.
As for pvp in DF you wont see brew doing high level anything. Sure you can get in and mighty ox kick people off cliffs but you are get melted in rbg’s since most people take magic using ranged dps, which brew can’t stagger. And you have reduced stagger in arena, you will actually die before you get to a red stagger in pvp.
But this is all based on the current build and we saw just last week bear druids went from unplayable to being the top tank right now.