I think the D3 model is fun. I was actually disappointed at how different D4 is, once I got through the storyline. I do agree that the grind is too great. I basically stopped playing after I finished the storyline. I tried a couple of different builds after increasing the world tier, ran out of gold and got stuck with a build I didn’t enjoy, and quit logging on. It’s worth noting that I’m just a casual player who would create a new character each season in D3, get to GR100ish, and then get bored and stop until the next season.