It wasn't really that there was anything wrong with the game on its own, but, as a Grand Theft Auto title, it had completely deviated from all the other titles. The environment was oppressive, and it made me play in an insecure way. Like, I didn't want to run over people. I didn't want to get caught by the cops. The realism made it immersive in a very uncomfortable way.
Replacing all the side-missions with minigames wasn't a great decision, either. I found myself having more fun playing pool in GTA:IV than playing the actual game. Easily, one of my favourite parts of San Andreas was the turf wars. I loved that. I wish they'd kept those side missions. Plus, when you found a weapon lying around behind a house, it felt like, as a player, you'd been given a wink and a nod from the game designers telling you they were on your side. In GTA:IV, I didn't get the feeling that anybody was on my side. It felt like they wanted me to lose, not to win.