The environment, music and general atmosphere is just exceptional. Both the world and the dungeons I saw were top notch. Very much a successor to Diablo 2 in that way.
Played a melee rogue, largely enjoyed it. Plays fast, very responsive.
Not really impressed with the actual mobs. First off, not that impressive visually. The variety is mediocre, they seem very randomly mixed and I cannot say any of the abilities looked impressive. Dungeon end bosses seemed to have some tactics but everything else was just attacking. Maybe it is that it is an early act/low levels and some abilities are off to keep difficulty low? That said, plenty of new monsters (vampires in Diablo feel weird to me)
Very much missing the constant journal entries from D3. They really helped with world building. Found very few in D4. The world is so detailed visually I wish we got more lore.
As for the story, it is appropriately dark. Lilith definitely has a chance to be a more compelling villain than anyone in D3. Still the story itself does feel generic.
- - - Updated - - -
I am hoping part of this is that we are playing at low level and world tier and that the boss mobs at least will have deeper tactics. The random mix of mobs though isn't helping. No idea why an abandoned keep was conquered simultaneously by werewolves, bandits, arsonists, ghouls and vampires (still not sure if they are meant to be vampires but the sillhouette gives Nosferatu)