@Mardel

Just for clarification, the situation you are describing is not what I was talking about, I have no problem with dps going all out at the beginning IF they are using quelling. The problem I brought up was with dps that either start before the tank has engaged or even gotten in a lob or who go all out and don't use a enmity reduction ability.

I know there are bad tanks out there who don't establish agro and just run in flash once, usually too early so things aren't even hit, and then use the riot combo. I see these tanks all the time when I play heals or dps. Bad tanks however is a different topic altogether IMO.