I find that people who play Tanks have a bigger chance to be a total diva about everything i guess they have a sense of self importance but their job isn't always the most complicated in the group. I honestly have more fun in a zen group where everyone is patient and just explains why people died instead of screaming at them so they get nervous and make more mistakes. Everyone gets a bit of instance rage now and again but some people start making ridiculous demands of people for experience and gear or blame everyone else when they make a mistake instead of trying to learn.