Season 4 is a lot more fun, but I still think D3 is a better game. But if you compare D4 to what D3 was like at after release, D4 is in much better shape. It’s definitely heading in the right direction, and I suspect that the expansion in August will make it much better, similar to how D2 and D3 did.
Back to season 4, I leveled to max level, maxed out the battle pass, and experienced all of the content and that was good enough for me. I want really interested in sticking around to switch to better build and get the best gear.