I've become somewhat disappointed while also ecstatic about some other aspects.
~New Art & 3D graphics=Duh, Good
~Different classes as well as one classic=A+, my favorite part of the first two was exploring the different classes.
~Automatic stat allocation=Eh... I could get by without working my stats, but experimentation was the spice that made diablo a delicacy.
~Purple texted "Epic" weapons=Kinda bad. I don't understand what was wrong with the old magic/rare/unique system so what made them decide to scrap it?
~New skill tree=Good & bad. Having required points in one spell just to use another seems silly. Of course, diablo 2 had some skills that were required to reach others, but it was a case of drop in 1 point and move on. This new system sounds like it will need more points invested into early skills for later ones.
I guess for me I'd rate it as a perfect 5 at the moment (On a 1-10 scale).