I have 3 level 30 characters. I can do every role 100% with my hunter. Other classes are limited to certain jobs. Punter is the best for raid unless you are a cheater or some bitch with bad guns who can't kill the things around you quick enough. Bubble is for people who are slow and weak and need a few seconds to take a break. Warlock is for noobs who die or want to push the bosses off. Hunter is the best for good players. Titan and warlocks are for scrubs who are a little slow and can't keep up with hunters.