From reading the forums, I get the impression that some classes are intentionally useless (Druids, Shaman, Enchanters, Bards), some are way underpowered, and some are glitched (Zerker epic, from what I've been told).
1) Which classes do you all think are broken and why
2) How would you recommend this class be fixed
3) Realistically, will Hunter fix said class
4) (other useful information you think pertinent to a productive conversation)
Simple answer is: Until Hunter gets around to it don't play them as a main or an integral part of your team. Class balancing has been discussed ad nauseum, and it usually bears no fruit. The main factor is time, waiting for Hunter to have enough available to spend on the project.