Bioshock 2 - good story, terrible gameplay. Hated it and gave up after an hour.
Witcher 2 - too linear, required too much feedback from the player for an RPG + you only could play as a male chauvinist pig:P
Portal 2 - I didn't actually buy it so my opinion might be biased as I haven't played the game but whats so fun about a puzzle game anyway?
Rift - tried the beta. Horrible animations, bad, generic story and pointless gameplay. Liked the customization though
Assasin Creed 3 or maybe 2 - I didn't really like the story that much even though it wasnt necessarily bad, hated the gameplay though so gave up after a few hours.