A great game, hunted by unintuitive controls. Looks like the developers of this game where able to implement everything they wanted, which can't be said about most games. Usually what happens, developers become over ambitious and end up putting a third of the content they originally planned. That doesn't seem like the case for GTA 4, which is flooded with insane amounts of content and features.
The problem with this game is that the controls seem to be a bit off. Something about them isn't fluid enough. Another thing would be that the story doesn't have a proper build up. At one moment you have this epic thing happening, but the mission isn't more than a chase mission. Then out of no where, things become intense, then drop back to being casual. It's all over the place.