The endgame loop is pretty good once you get into a rhythm. I bought the game back in 2013 so I've seen most iterations of the game and it definitely improved from its state at release substantial.

I'd say once seasons became a thing I solidly hit more than a few seasons pretty hard and enjoyed it. Honestly the story is somewhat secondary in Diablo games because it ends up fading into the background eventually. But this is why d4 story stood out so much to me -- I'm actually looking forward to replaying it as opposed to it just being some obstacle to getting to endgame and starting to increase difficulty to the point where the good shit really starts dropping