When I actually have the time..... I try to do damage on Fallout 3 (I hate F4-new vegas) and I also still like GTA SA.
F3 for the weapons (their raw power basically makes the player invincible at any difficulty setting!!!), and I like GTA SA for the vehicles (cars, fighter jet, helicopters, jet pack, hovercraft, etc...) and endless police chases.
I've beat both of 'em so many times I dont even bother with the story lines or quests anymore.
Wish I still had SimCity 4Deluxe, I'd rather be playing that instead of the above games.
(Yeah I agree Voyager, and I think dead space is one the the best shooters ever. It beats halo by a long shot.)