Well imo wizard is quite good, so playing hc with one isn't a problem. The one and only class I think I'lll never use is DH, in hc mode at least. Why ? Because of the poor life / armor items, full dps won't prevent a boss hit or two, and eventually you will get killed. What do you guys think ?
I don't think I'll be playing a HC barb, somehow I don't see how the mentality of trying to get through the game multiple times and the way barbarians are played go well together. Throughout HC your on edge, playing tentatively, but with a barb you'll be forced to go face first into the action which could be devastating in higher difficulties. Id prefer a distance fighter like the demon hunter or wizard, just safer in my opinion. However this could be exactly what people want from HC, that rush of diving into the action with the threat of not coming back..