I've never played an MMO seriously before and I'd love something that would let me see what kind of dps, relative to my level, that I'm doing so I know I don't suck. If my group is dying because I'm not doing my job, I want to know so I can try something else and get better.
As is, I'm basically playing this like a single player game... a single player game that I love. But still, a single player game. Obviously not only because I have no idea if I suck or not, but having some numbers to boost confidence certainly wouldn't hurt.