D3 looks innovative because...
1) D2 took tight atmosphere of D1 and reduced it into vague wandering... Never felt the tight atmosphere of horror again.
2) Suddenly, mythology was mixed up in D2, we went from Dante's Inferno, to somehow incorporating Egyptian lore that looked vaguely generic into the scenery...
3) D3 actually has STORY to the areas.
4) D3 incorporate spell runes, something I've been waiting for a long time.
5) D3 has crafting.
6) Art style is unique, or least inspiring.
7) D2 removed spell tomes. Would have been better to have both skill trees AND spell tomes, or simply distinguish it from WoW by going back to original system. Did not like warriors having spells, but the fun of finding loot, seeing my spells jack up, overwhelmed it...
8) Horadric cube was only innovative part of D2. Team went on to make Torchlight... Suddenly, a voice in the cloud proves I am right. "Wut? We give Diablo a facelift and it will sell?" "Yeah, let's remove all plot and meaning from our actions, give it a vague acuity, and we're in!" "Alright, I'm game! Let's copy a copy of a copy *cough*Nethack." If Hellgate was Meh, Torchlight was the damnation of modern gaming. No innovation = no future. I do not waste time with timewasters, too many past games to waste time on like... ta da... Morrowind, Arcanum, Bloodlines, Fallout, et cetera, et cetera, ad infinitum.