I really enjoyed D1, despite getting very average reviews initially, to their credit they fixed so many of the issues and it ended up a great game.
I have been playing the D2 beta on PC. There are a lot of graphical bugs but gameplay is pretty solid so far. I preferred the original snowy setting, I am surprised how much I miss it. The graphics are really something despite the bugs.
Based on what I have played so far, I'll definately be buying this.
One thing that is frustrating, is they do maintenance between 8-12pm at nights for us, the time I would usually play!