D4 feels more like a sequel to D2 than it does to D3. The style and feel is much more in line with the older titles.

The story I think is pretty solid, and though I haven't played all the ARPGs out there, it's the best one I've seen, and it's presented well.

The open world gives you a good mix of activities between the main story quests, and there are lots of side quests that you can get side-tracked with.

It's also a really polished game overall, performs well (at least on the Series X), and they've provided a decent baseline of content for a launch. Though I can't speak to the longevity or end-game activities yet.

But overall, I'd say it's almost incomparably better at launch than D3 was. As though it was made by a different company. Biggest question is how ActiBlizz handles monetization and how well they are able to improve and build upon the foundation going forward.