Heavy Rain
Oh, god damn it, Quantic Dream. You had a really great game going, and then you have to go and screw it up right at the end. I suppose it's still better than alien Aztec robots or whatever the heck happened in Indigo Prophecy (which I never made it through due to horrible stealth sections, which Heavy Rain thankfully lacked), and you managed to make it until almost the end this time before you blew it.