Diablo 3 looked fantastic when it was first announced 3 years ago. Now? It's pretty much meeting the standard, not going above it, and most certainly not pushing it.
Having said all that, yes Diablo 3 looks like fun to me. I will buy it. I'm just not excited about the game like I was 3 years ago. I do not go out of my way to follow it's development in any way, shape, or form. When I stumble on posts like this, I check it out, then go about my day without any real change in my attitude towards the game just because I have no date to look forward to. Even if given one, chances are it will be delayed. It's Blizzard. They have a history with this problem.
By not knowing when their games will be released, they lose a lot of steam for me. Just look at SC2 which began production in 2003-2004. In the time it took them to release that game, Relic released Dawn of War, 3 expansions, it's sequel Dawn of War 2, and it's first expansion. WoW follows a similar template of releasing content too slowly. EverQuest released 2 expansions a year with a fraction of the profit that WoW produces. Hell, it's taking Blizzard a year+ to produce an expansion pack for SC2. An expansion that still has nothing official attached to it yet. It's crazy to me. It's also frustrating.