I am in the diablo 3 beta and it seems Warrior is the way to go for easy mode. Demon Hunter is great as long as you keep your distance and dodge the bolts of ranged mobs. Witch Doctor is way too underpowered and not as good as i expect it to be as "a better necromancer", and monk is great, not as strong as the warrior but he is a bit fast... think of it as a kung-fu priest.

Game is somewhat laggy, expecially on online when you face against large amounts of mobs... And you can only go as far as Act 1 so you beat the beta at level 9 or 10 of your character in solo.