Just finished the story. I opted to let Rascalov live, but kept a save game to play it through the other way (killing him instead of meeting with Phil Bell).
At times the game was awesome, but now I feel somewhat let down. It's not a patch on SA or VC. I don't know what the reviewers were on when they all gave it 10/10 or whatever. It was a good game, nothing more. I will play it through again, and give the multiplayer a go too, but it's just not so much fun as the older games were.
I really hope the next GTA is better, it damn well needs to be.