Degaulace your missing the point of what I said. I didn't agree or disagree with the tanks that you are running with. The point is that as a DPS yes your job is to kill mobs however it is not to engage the instant a mob is tagged. As a DPS you have the responsibility to allow tank to settle and begin threat rotations. Sometimes it means waiting longer then normal which with unknown pug tanks this should be assumed. With tanks you run with normally you get to know the threshold of when and how much you can do.

As DPS a you have a role to play in effectiveness. Sometimes means holding off the trigger longer then you normally do.