I never play PC games for some reason, I guess since I work on a computer for my career I don't like spending even more time on them ha ha. I don't play video games that often, but recently I have been going back and forth between Oblivion and Fallout 3 on xbox360.
My favorite PC games that I have played though, have been Fallout 2, Americas Army (I was actually pretty good at this one, loved playing a sniper on the snow mountain level), Diablo, StarCraft, plenty of those war simulators like Total War Rome & Shogun, and I really love the Romance of The Three Kingdoms series of games.
Back to consoles, I love the Final Fantasy games, but the newer ones not so much. I wish they would remake the original one in today's technology.
And I really like two very old games for the Sega Genesis, they are Shadowrun and Masters of Monsters.