Early on in this game you realize it is not just a copycat of Grand Theft Auto. It has an intriguing story line, excellent gameplay, and an amazing open world environment. I really couldn't stop playing it after I started.
Although the story was awesome, I spent a lot of time running around stealing cars, getting in high speed chases with cops, and busting drug deals. The environment was the most amazing part about the game, all the combat skills you learn during the game are used any time you fight and nothing is more fun than high speed chases.
Now I just hope there is a sequel.