Diablo 3 was following Diablo 2, so there were very high expectations before that.
Diablo IV, has a shown a good amount, and has mostly very positive reviews. It’s return to the dark and gritty world of Diablo II. There have been couple of demos, and the game looks and plays great, and most diablo fans are very excited.
One issue the game has, is that it’s more of a live service game, so one world, shared by lots of players.
BTW I haven’t seen the after-release reviews by normal people, but it has gotten very good rating.