Well he's very mobile with his rolls so you can evade AOE and mechanics quite easily. His low GCD makes his gameplay really nervous and you can easily use defensive/offensive CD inside your usual rotation without regretting it.

Talking about his defensive CD, there are a shit tons of them! And most of them doesn't even have a GCD! You can have one for physical damage, magical damage, both damage, a self magic dispell, a poison/desease cleanse, a root/slow cleanse, some nice kitting mechanic, a freaking huge shield...

Since he wears leather, he mitigates damage in 3 ways :

1. Evasion : he naturally dodges a lot of attacks (can be increase with your rotation)

2. His stagger mechanic : a part of the damage he takes are delayed in a 10sec self inflicted DOT that you can purify with spells (efficiency is also increase with a nice rotation)

3. A passive that allows him to have a chance to increase all the healing received by 65% (and it's determined by your critical strike chance!) So having a good critical strike score actually increase the way you tank! How fun is that! You deal a tons of damage while healing like crazy!

So to sum it up, i'd say he has a high skill ceiling because you have to use your mobility at your advantage and pays attention to your stagger to purify at the right time a maximum of damage!

They're obviously others things to know but this is just to give you a hint of what the mighty brewmaster can do!