I never had performance issues but I had glitches like when I would fight a boss and they got stuck in one place I would kill them easily, it sort of ruined that boss fight. I had other glitches but nothing terrible. I do understand that people thought they were going to walk around night city open world style and missions and progress were going to seamlessly integrate with their open world experience. In a way it does when you walk around the map but I can see that people expected the impossible, and there were to many buildings you couldn’t walk into, and npc player interactions that could only go as far as “hey! Watch out!” could be disappointing depending on expectations. One of the things I think they should have done better with was the driving, the cars were very difficult to control. Other things I’m sure were not possible but driving they screwed up a bit. I heard the QA testing group really screwed them up by not providing good feedback. On my second playthrough which I haven’t finished I pretty much did every mission and ran around the city on foot completing ncpd alerts