How can you tell a bad tank?

[Gemina]

Oh man. There are so many ways a tank can work against the party: A tank holding aggro can deliberately face the boss towards the party so everyone gets cleaved; they can shirk a DPS player or healer for giggles; they used to be able to stay in DPS stance and get one-shotted by an unmitigated tank buster; they can see their MT sitting on 5 stacks of vuln^ and not provoke. Tanks that don't protect anything other than their inflated egos.

Yup. I'll take a squishy tank any day over the aforementioned. Squishy =/= bad tank. Squishy simply means the tank needs better gear, to pull less, and/or use mitigative CDs better. On the other end of the token, I've had tanks who are nigh invincible think they are gods, treating everyone like crap, and just abusing their tank privileges by doing things like not avoiding AoEs, not using cooldowns, initiating vote kicks for no good reason, or pulling wall to wall without considering the safety of it.