Pretty good. I'd go Act 2 > 3 > 1. I don't actually care for the greater sandboxy nature of Act 1, and I didn't run into so many bugs later, so the later Acts better story and character pay offs were much better than what was in Act 1. I also had no issues with the pacing of Act 3 that I had seen many people say, though that may be because other games have had worse and made me numb to those sort of issues, no clue. There are minor issues that persisted throughout like pathfinding being awful, sometimes AIs breaking and taking a minute before deciding what to do, but they aren't so bad as to impact my enjoyment. What does bring the game down is a few character's lacklustre endings and the nonexistence of any substantial epilogue As of Patch 5 they have since added an epilogue. It's not perfect, but it provides much more closure for the main characters, and even for most of the side characters' story threads, so it was good enough for me to warrant upgrading the game from a 9 to a 10.