I generally beat the games I get, although sometimes a game will piss me off and I'll return it.
Just Cause 2 - side mission where you steal a jet and have to blow up a base with it, except the controls for the jet are dodgy and the draw distance is tight in, so you can't do much damage before you have to pull up and swing around again...
Bullet Witch - *barf*
Clive Barker presents Clive Barker's Jericho by Clive Barker - wasn't fun, relied heavily on surround sound being precisely tuned so you knew EXACTLY where the monster out of sight was, and rampant QTEs...
Kane and Lynch: Dead Men - *blech* glitchy and it wasn't exactly interesting in the beginning
Demon's Souls - it made 10k souls (currency/xp) evaporate because I went over to my gf's to get laid, and it just wasn't fun to me...
Baldur's Gate 2: Throne of Bhaal - um... I should really give that another go, start a new character straight from the beginning of SoA...
System Shock 1 - I didn't get this until right before I went to college and then got sidetracked by linux and beer and other things...