I thought the story for diablo IV was pretty compelling. I enjoyed it and the sidequests, but the core gameplay loop got really stale and respeccing to use another loop was onerous. The mobs levelling with you made every place feel homogenous. There isn't much in the way of an endgame, eventually just maps that will one shot you. Their making good uniques basically impossible to get certainly didn't help. The lack of storage completely sucked, I saved gear that might be good for other specs I was interested in trying out and that precluded my being able to play other classes completely as there was no room.