1. Ninja Gaiden Sigma
I got to part with the rocket troops and said "fuck this game"
2. Gears of War
The PC edition. My old PC was too slow to run this, so I bought it on 360 when it hit Games on Demand. Then I bought a new PC. Odds that I will ever play this game? Not good.
3. Castlevania: The Dracula X Chronicles
I thought I remembered enjoying those old 2D NES Castlevania games, but you know what? I don't.
4. Baten Kaitos: Eternal Wings and the Lost Ocean
I've been meaning to sell this game on Ebay for about 5 years now just to get it out of my house. Maybe I actually will one of these days.
5. Call of Cthulhu: Dark Corners of the Earth
This is the only game that's ever made me physically nauseous and given me a splitting headache to boot. It's too bad too, because I really wanted to see how the story unfolded (I'm a big Lovecraft fan).