i know i am going to get flame for saying this, but i had more fun with saints row the third than this. (with all the immaturity in that game). Even though both are "open world sand box games"
Flamed by who? The general consensus is that Saint's Row: The Third is a much more enjoyable experience than Grand Theft Auto IV. I share that opinion as well.
That being said, GTAIV is still enjoyable to me, and since the game doesn't run so consistently on my PC, I am going to bite and buy this for myself again, for old times sake.