I played COD Zombies a LOT when it came out, but I got tired of it. I can't seem to feel the same fun when I play it now. Also, I played DinoSmash Online when it came out so much, that I gave up after 4 days lol.
Galcon............ nah who am I kidding, I still play it pretty much everyday after a year! (Glacon Labs helped)
Running With Scissors: Pre-Season, Driver, NOVA (multiplayer), Parcel Panic, Jet Car Stunts and Ravensword
All of them. I have like A.D.D. or something when it comes to game, all games and consoles for that matter, I fall in love with one, get bored quickly, put it down, say I'm gonna play it again and never see it ever again.