The main thing going for D3 is that the core combat is way more fun and addicting which will pave the way for additional content.
The combat is amazing and totally helps to quell my issues about the itemization at this point.
I am a huge fan of the play that potion cooldowns and the health globes create in higher levels. As a barb there are many times where I am teetering on the edge of death after burning through my potion and doing everything I can to just stay alive and keep hitting the mobs to get that essential globe to drop (thanks Pound of Flesh!).
Also, the strategy of leaving globes on the ground either after a fight or during in case I need to kite a champ/elite pack back to them or make a last ditch leap to one during a fight to keep alive is fantastic. I get so many under 8% health bonuses.