After seeing tons of videos about the game (specially the character creation videos) I must say that I am totally disappointed about the game. It is nothing like D&D. I was expecting an experience similar to Baldur's Gate and Neverwinter Nights rule wise and what I found was a Diablo clone...
I don't have the game, but I've also seen previews, and honestly I had the opposite feeling... to me it seemed a lot more like Baldur's Gate than Diablo.
I played both a long time ago, and Baldur's Gate to me was mostly about
story and
exploration, plus a little bit of character
interaction. Combats were always different because of the variety of opponents, and they very
tactical because of that and because of the option to pause and think about it.
Diablo is a
shoot-em-up. There is almost nothing tactical in Diablo combats, they are just too many and too fast to even think about it, and monsters are all very similar to each other. There is only
strategy in building your character by carefully choosing combos that optimize attack and defense around a small set of options (like one debuff trick, one area attack, and little more). The only tactics required are when to use either of those few options. Then just repeat for a thousand hours to unlock all cinematics.