GTA4 is both very similar and very different from San Andreas. What did you most enjoy about SA?
Everything pretty much, the freedom, the huge world, the "living world" nature of the game, the story, the gameplay!
I know 4 is a lot more restrictive in terms of its world size but i'm hoping pretty much everything else is intact.
Regarding controls, as its a GfW title, I expect it will mirror the 360's controls if you have a 360 pad. I'll let you know how the pad works next week.