I can't get GTAIV to work on my crummy laptop, but I do play Vice City and San Andreas, though not to completion. I prefer exploring the area rather than playing the missions, which is why I'm currently working on Los Santos (and later all of S.A.) in Simcity 4.
Maybe I should ask for a console for my birthday. Which should I get, Xbox360 or PS3? I assume GTA:SA is playable on either; are they both backwards-compatible? I'd probably lean toward Xbox if it also plays Doom3. Too bad SimCity is only available on Wii...