FIFA 10 has to be the worst game I've played. Maybe I'm just horrible at the game, it was my first time playing Soccer on a game console. I played it off and on for 5 days that I rented it. Out of about 20 games that I played against AI and friends on Xbox LIVE, I never won a single game.
Does this count? I don't recall the details but it involved lots of vodka, cards, waking in a tent naked next to an older woman thinking WTF where am I and who's she..... I'm not playing that again!
strange how I have a hard time remembering the worst games I've played. Some games are so bad that they end up being good.