Well actually it's more of my impression on the game itself.
I feel that the game delivers what I expects from a Diablo game. The control is good, everything feels right and not clunky like most of the Diablo Clones out there. The environment looks good and definitely not cartoony. Enough to say that graphically, the game looks astonishing.
Gameplay-wise it is a solid game with even more action than its predecessor IMO. The number of available skills is a bit limited but I understand what Blizzard is trying to do. And simplifying the gameplay is not always a bad thing. It actually makes it a lot more appealing to me personally.
In short(although this is already short) I'd definitely buy Diablo 3 and will probably play it for quite some time. At least until Guild Wars 2 comes out :D
Here's some screenshot from the beta: