All three of the Grand Theft Auto series, but mostly San Andreas. I pretty much play the GTA series while I'm high, 75% of the time.
Star Wars Battlefront II
Champions of Norrath
Madden 07
Tiger Woods golf
Reel Fishing III

Also, anyone who does not put at least 2 hours worth of their video game life into God of War, is seriously missing out on video game history. Truly, the definition of an epic video game.