Let's start with the graphics. It's outdated by at least three years. It looks similar to Torchlight which was released in 2009. Sacred 2 (2008) looks a helluva lot better than Diablo 3 at the moment. I've said several times in the past that graphics isn't really that important, but there are limits to how poor they can be for their time, especially when the game is coming from one of the most successful developers in the past 15 years.
I agree the graphics don't look great, but this substantially improves them:
http://international.download.nvidia.com/geforce-com/international/comparisons/Diablo3/Diablo3-AO-Comparison-1.htmlIt's exclusive to nVidia cards, which thankfully I have.
Then there's the game world. While I've only played for an hour or something, what I've seen so far is pretty disappointing. One of the things I like about Diablo 2 and the Sacred series is that there's a lot more to see and many, many more monsters to kill than what you encounter while doing the main quest. What little I've explored of Diablo 3, all you do is follow a specific path where you more or less have to kill every monster on the way. Sure, this might change later on in the game, but the first impression is that it seems very limited.
Recently people found a bug in the beta that let them play further than what is already there, into the Festering Woods. Player feedback has been unanimously positive, saying it's much more fun and far different from the rest of the beta content. Of course if you only played for 1 hour, then you never really gave it a proper chance anyway. Go back and play Diablo 2 for an hour and see just how much there is to "see, and many many more monsters to kill". Really the first hour of Diablo 2 is not very impressive either.
Finally there's the thing that has ruined WoW. The game appears to have been dumbed down. Again, my knowledge on this field is limited to what I've seen in my beta, so it might be entirely different. You don't get to choose your stat points anymore and iirc you don't have much choice when it comes to choosing abilities either (gief back three different trees ;( ). And what's the point of leveling up if all that happens is that you get some more base stats? Automatically I might add.
The auto-stats design makes sense when you include free-specs, though. They included free-specs for various reasons, as I've already gone over multiple times. Now if you include free-specs, what's the point of letting players assign their own stats? It just means when you find that new piece of armor, you'll take out your vitality points and move it to strength so you can wear it. Or when you get past the "hard" part of the game you move all your stat points back out of vitality and into other stats. Also stats in Diablo 2 weren't actually "fun" anyway. Everyone put in enough str and dex to wear their equipment and then put the rest into vitality. You only had an illusion of choice, not anything that made any fundamental difference to the game.
Now, if you were just playing Diablo 2 casually, then yes, you did have choice. In which case you'll probably be playing D3 casually too and therefore won't mind the change. If you played D2 very seriously, then as noted you didn't really have any choice anyway because the "best" way to do stats was to pump everything possible into vitality.
I honestly think a lot of this criticism of D3 is just looking at the changes at a superficial level and saying "wow, that's so noob-friendly!" without actually stopping to consider the actual outcomes of the systems as implemented in Diablo 2, why they were arbitrary and for the most part not actually fun.
None.