Actually, Thor, I tend to play by it by ear. The post-D3 announcement euphoria has worn off, so yes, I do agree that the gameplay does look similar.
However, it appears a tad slower paced than D2 to me. And its only probably in pre-alpha, so there's still a long way to go, and I think, if I were Blizzard, I'd premier D3 with some similar gameplay stuff, to assure the fans that, "Hey, its a new game, but don't worry, it will be familiar to you guys." Then as time goes on, I'd preview newer stuff.