I had a guest pass so I gave it a go. I agree, it is little more than Diablo II with better graphics. Now you can see why I don't like Blizzard anymore - They no longer seem to be interested in innovation or pushing gaming forward, it's all about the easiest way to make a buck by just rehashing what they know worked even if the formula is almost 15 years old.
It also didn't help my perception of the game when I was one hit away from killing the Skeleton King in Single Player mode but got interrupted because Battle.Net dropped me out for no reason. I had to restart the whole floor and boss fight. I can't believe that I need to be connected to the server at all times to play single player
Blizzard along with Bioware, can be added to those once great games studio that fell to corporate greed.