I personally hated the game... I had it and traded it in the very next day. However, I heard it is 100x better for PC and PS3 than it is for 360. The gameplay was just repetitive and boring for 360 and the online multiplayer made me want to kick over a magazine rack.
The PS3 version is exactly the same as the 360 one, and the PC version is too, except for having potentially better graphics. And it's an excellent, excellent game. Far Cry 2 was one of my favorites of last year. If you have a little patience, you'll love it.