Mob levels definitely need to be increased, right now they are very easy for the sake of driving sales on DLC, and for that I can't blame the Devs for. Gotta keep the bean counters happy if you want to push your product to the next level. The Devs are listening, and I'm sure we'll see more class distinction as the mob difficulty is increased. My opinion on the matter is to offer a "Heroic" version of all the DLC with raised mob levels to promote better group play through class reliance.