You know, the DPS that always dies, the one who draws too much threat trying reach the top of the DPS chart. Or, maybe he fails to move out of fire so he can finish his cast. Possibly, he starts his AOE a little early in Thorim's arena. He thinks that he doesn't need to continually move during the Hodir fight because that would hamper his DPS.
Anyway, you get my drift. As a healer, wasting mana and time healing this guy is very frustrating. Wasting Battle Rez's is even more annoying. So, besides just bitching, I'm curious if every raid has some version of "that guy." If so, assuming you aren't the raid leader, how do you address it? I ask because there is nothing more annoying to me then listenting to people bitch at others and throw out accusations in Vent.