What's with the whining, there is only 3-4 threads on Diablo. Hardly the end of the world? Think back to BF3's release and go whine about that instead.
Big official threads always end up being so big that it's a pain to keep on top of and not miss things...
On Topic mode...
Only got the trial version of the game currently but tried all the classes bar Wizard which my housemate has been playing.
Tried Witch Doctor first which was quite fun, imagine it would be a great one in co-op mode. Seemed to lack damage in the levels I played.
Barbarian was my second class to try, once you get cleave it's hiliarously fun. Smashing mobs away very quickly. Got a killstreak of 86

Having no ranged attacks would possibly get annoying vs some enemies though.
Demon Hunter seemed ok, some nice moves but like with the Witch Doctor didn't seem to do a huge amount of damage - granted I didn't manage to find a decent bow.
Monk was better than I was expecting, seemed fairly similar to Barbarian when I tried it, just less fun!