Yeah, there's a fail train. a pug of 4 DK's and one healer.
DK's have been pretty much nerfed down to the rest of the herd. Some would say they have been nerfed to the point of lagging behind other classes.
Unholy DKs, even after the recent hot-nerf, are one of the most powerful dps classes at the moment.
8K DPS.
I'm usually a few hundred behind him unless it's a long single target tank and spank.
Blood isn't what it used to be, but then again blood was OP for most of Wrath. "Hero" class or not, DKs don't have an inherent right to be ahead of every other class in every dps situation. Arcane mages are OP at the moment, especially considering the fact a moron could play one, but everything from locks to hunters to rogues and DKs are in the top ten ICC at the moment.
In any place other than Icecrown (due to the 20% dodge reduction which has relegated DKs to the role of off-tanking for which they were originally intended) DK tanks remain fully viable.