The story is decent to say the least and the textures are grim and gory as they should.
That's about all good to be said about D4.
Balancing doesn't exist in this game. The feeling of difficulty is all over the place, with seemingly meaningless changes to your setup having as much impact as the ones thought through. The further you go with the grind, the more awkward it becomes as the game just adds parameters on top of the ones you're starting to get accustomed to.
Of course, if you throw enough s*** at the wall, some of it will stick. So if you're open to repeat the same pointless activities over and over - you'll be fine.
Too me it feels way too much like a mobile game. Sorry Blizzard - I believe it's beyond repair.