This game is a extra to carry on the GTA franchise.
The game play on GTA San Francisco, i believe is excellent. The missions are innovative, but can sometimes get repetitive, there are also so many of the missions that it keeps you hooked hours at a time.
There are so many guns and weapons that you are able to use on the game, and the number of cars are endless. I have played it on a number of formats, PC and Xbox 360, i do prefer the controls on the Xbox 360 as they are easier to use but the pc game play makes up for that. It can get fiddly on the PC if you're in a difficult situation moving the mouse around as it can be unresponsive, whereas the Xbox360 has no problems.
The graphics are also impressive and build upon the previous games.
I really do have to say that i love the game the free roaming once you have completed the game is unbelievably good.
I do have to confess i do use the vehicles cheat as it allows you to fly planes and cover the whole map in an instant.
I don't have a bad word to say about the game, as i would recommend it to anyone.