The game has good mechanics and looks very good. The only issue I take with is the story which is just weak. Weak when compared to Diablo 2. It's full of plot-holes and exagerations.
Spoiler
I mean they actually want us to believe that everything that happened for the last hundreds of years, the events of Diablo 1, Diablo 2, etc, were the plans of Diablo. They actually want us to believe Diablo planned for the other evils to rebel, banish them to Sanctuary, get caught by the Horadrim, get imprison in soulstones, break free, get their soulstones destroyed and then have them all get absorbed into one black soulstone, which Diablo could then use to become the single Prime Evil.
How stupid is that? Very stupid. They couldn't come up with a decent story and they had 7 years to do it. The gameplay is very good and addicting as hell. But I just can't find the motivation of clearing levels when the story is that weak, and pvp hasn't been added yet. I'll probably get back into D3 after pvp launches.