As much as I like diablo I can't get excited for 4.
3 was just meh overall to me. It was like they took everything diablo, wrote a manual on how to make a diablo game then had someone make one following that manual. It just didnt feel like I was ever exploring anything, it had too many time wasting mechanics in it like all the base upgrades and finding recipes for things, the gem crafting aspect, and all these little things there that I just did the bare minimum of because I didnt need it and felt tacked on. And it felt like the whole game was just a race to the finish. It wasn't even challenging, ever. Sure you could play on higher difficulty but just giving monsters more hp and dmg isn't necessarily more fun. And the expansion where I finally get a necromancer I find was not fun to play and missing what used to make me favorite class less interesting.
Just overall it felt too by the numbers, too much fluff busy work, too much polish and perfection, too uninspired, too safe. It was the start of what blizzard has become, and that is very sanitary and clean with very little risk.
Blizzard is like Nintendo now. In the sense that they are very exact in what they do, take no risks, dont move outside a well proven formula, try to be very in offensive in their content, and very much stay tightly to their rule book. They both make good games of high quality, but neither do anything truly new, exciting, unique, or different. And both try very hard to give a very specific game experience that is accessible to everyone.