When I played Diablo 2 I loved it... Titan Quest awesome, however Diablo 3 I got a guest key and there was nothing there that made me rush to get my credit card and especially at that rip off price!. The ground based graphics are not the best i mean everything is wowish and it all looks too smooth, I like it gritty, sharp, dark and evil.
I know what you mean, while I'm really enjoying it, it doesn't have the WOW factor I was expecting (and no, I don't mean "WoW"


If you are looking for something darker and grittier, maybe look at Path of Exile or Grim Dawn - both in development and look promising!
For me though, D3 ticks all the boxes and I'm really looking forward to playing it in co-op with a couple of mates!