Elusive Brew might have a cooldown but it's definitely not an "oh shit" button.
It's unreliable on 2 parts: first you could only have a few stacks where you're in danger and it won't last long, second it's and avoidance button meaning it's tied to RNG and lets say with Shuffle up & Elusive Brew up I have around 70% avoidance, there is still a 30% chance that the boss hits me straight in the face and I can do nothing about it.
"Oh shit" buttons are things like Paladin Guardian or Purgatory from Death Knights (although it's passive). Things that save your life when you're in a REAL danger of dying.
I don't see where the Brewmaster has that kind of stuff.
We have a freaking T30 Heal we are not allowed to us unless we want to fuck up the rest of our Active Mitigation.
We have 1! REAL CD - Fortifying Brew which one could see as a bad Shield Wall.
And we have a unreliable CD that gives us 30% Dodge for a certain amount of time so we can pray to God (or whatever) that we will not be hit.
I'm glad that I'm tanking with a friggin Druid because I get at least one more CD with Survival Instincts.
But designing the Brewmaster as the Tank that takes the most damage without Active Mitigation AND giving them less CD's than any other Tank class...
That's just stupid design.
Ok so to give you a quick overview of Cooldowns:
Deathknight: Bone Shield, Dancing Rune Weapon, Rune Tap, Vampiric Blood, Will of the Necropolis, Death Pact(or its equivalents) and Purgatory.
Warrior: Enraged Regeneration(or its equivalents), Shield Wall, Rallying Cry and Last Stand.
Druid: Barkskin, Might of Ursoc and Renewal or its equivalents.
Paladin: Lay on Hands, (Divine Shield), Divine Protection, Sacred Shield(or its equivalents), Ardent Defender and Guardian of Ancient Kings.
Monk: Fortifying Brew,Dampen Harm(or its equivalents), Chi Wave(or its equivalents) and to a certain extent Expel Harm.
Sure there are a ton of others like Zen Meditation or Avert Harm for Monks for example but when we talk about Tank Survival Cooldowns thats it.
So we have 4 cooldowns, we are allowed to use 2 of them because of our resources and Expel Harm on cooldown.
So we still have MUCH LESS cooldowns than any other class, being the closest to Druids.
But the bitter truth is that Druids have a much higher passive mitigation than we have so we lose again.
I don't know how one is not able to see that we REALLY need a competitive Cooldown.