I am old enough to know not to buy in to the hype and preorder a game. But I did.
Normally I always wait a little bit and read the pros and cons. Personally, I would not have bought the game. The campaign is too short. Skills are so shallow, and gained thru a very non-Diablo way. Add the "always on DRM", and I would have bought something else. I hate always on DRM.
For those that say that the game is longer than I think, I do not think repeating everything over and over is a longer campaign. That is repeating the game over and over.
If you love it, then great. I glad you love it. But for me, it is just not worth it. I will not buy another game with always on DRM (unless I am playing an MMO of course).