Grand Theft Auto IV is by far the best in my opinion, and all the major reviewers on the gaming sites seem to agree with me. The world is a lot more interactive and the graphics are amazing—if you stand around and just watch the city, you can see that it is very fluid and that the depth to the AI around you is outstanding. The city is massive and I often get lost, but there are so many things to do and after a week I was only done with 10% (the easiest 10% that is). I have decided to buy the game when I get enough money, it was that enjoyable!