Depending on what you mean by "fail" as far as pulling shitty dps for there gear, I would say.. death knights, rogues, warriors, and warlocks, god I see so many of those 4, As far as Hai guys I can stand in fire it wont hurt? That would be mages, I don't know why but mages seem attracted to fire.
As for names it would be death knights, they have the most RETARDED names ever.