Originally Posted by
seed
GTA IV+EFLC (or San Andreas for low-end computers) is a must-play. If you haven't tried it yet, do it now.
Also, if you're into FPS and you're bored with the "S" part, you must try Portal and then Portal 2. But try not to watch any trailers before playing.
More awesome 3rd person games you should play: the whole Prince of Persia series (SOT, TFS, WW, T2T + 2008), Mafia I+II.
Whenever you get bored with commercial games, go try these indie goodies: Crayon Physics, Zombie Driver, Worms Armageddon (and 4 too if you want 3D), Audiosurf.