Played the Demon Hunter and Barbarian thus far. Loved the Demon Hunter. The mix of ranged attacks and fun utility abilities - as well as the emphasis on movement - is just what I'm looking for in this type of game. The Barbarian is way too one-tone for me. Whilst it's satisfying to punch the skeleton out of rotting meatsacks with a meaty thump of my fist, it boils down to just standing there and holding down the attack button. Also - for some reason, my Barbarian's inventory filled up way quicker than with the Demon Hunter.
Diablo 3 is going to be fantastic, that's one thing for sure. Just hope I'll be able to crank up the difficulty right out of the gate, for NORMAL is way too trivial.