i posted this in another topic, but i think it suits this discussion:
Diablo 4 is indeed darker than 3, but still not scary...
we are still the equivalent to superheroes killing hordes like they are nothing,
we don't feel alone and afraid vs an unforgiving world
and because it's an mmo you'll actually see other "superheroes" all around you, making the world a joke.
Diablo 2 was the same once you gained some levels, frozen orbing and whirlwinding everything down. Or even a high level mage in D1 spamming chain lightning, teleporting around the levels instantly doing Laz runs. The horror aspect never really worked past the early game.