Oh god, just remembered another one. I'm a little proud of myself for repressing that memory already! Thanks OP for dredging this one back up.
Kingdoms of Amalur: The Reckoning
Second worst RPG I've ever played, and it took over 90 hours to finish. I didn't realize how much I hated it 'till about 50 hours, but after spending so much time in it I was determined to finish. Never been so glad to complete and un-install a game as when I finally beat that one.
lol! I'm soooo glad I realized at about the 12-15 hour point how bad this game was. I think I would probably stick around to finish if I got to the 50 hour point as well.