D2 resurrected looks like it's lining up to be fun. The company that was outsourced to rebuild has said they didn't want to fix d2. They wanted to overhaul it's graphics and give it QoL. Same bugs. Same game.
Diablo 2 is as good as I remember it when I was younger.
As for D4 I have no idea but they seem to flail around and rely on community feedback too much which is a worrying sign for me.
Based on past track record, I don't hold much hope, though