Great game as I have discovered--the Developer's Cut is the one to have, imo. I'd like to see more of this kind of thing from Larian.
I also like DD (and I agree with the Developer's Journal about the title--I wouldn't have believed it went down that way if I hadn't read it...;)), and I even sort of like BD although I confess I'm still trying figure out some things about that game...!
But DII, in its DC form? Masterpiece material, imo. Shows what Larian can really do.
Also am enjoying D:OS a great deal, although it is an entirely different sort of game than DII. I like D:OS so much that I've started over three times (after only 4-5 hours of play each time) with different characters just to scope them out a bit better, and I'm still finding things I missed entirely in the other starts! I've settled on starting with a Ranger and a Wizard, and then picking up the other two, that I'm trading out at various times in the Hall of Heroes...;) Great stuff!