Dragon Age 2.
I'm convinced DA2 is not a horribly bad game, but it was the biggest disappointment. Origins was so amazing that it drove up an enormous amount of DA2 hype for me. Unfortunately the game ended up being meh.
Other games would include Diablo III, Final Fantasy XIII, Hitman Absolution, The Old Republic, Paper Mario: Sticker Star, or Valkyria Chronicles 2.
Desktop: AMD Phenom X4 955, ATI Radeon 7950 :: Laptop: Intel i7-3532QM, ATI Radeon 7670m
Consoles: 3DS XL, PS Vita, Zelda 3DS, PS3 Super Slim, DSi, PSP Go, PS3 Fat, Wii, GameCube, PS2
Now Playing: Metroid Prime 2, Dark Souls, Fallout: New Vegas, The Legend of Zelda: Oracle of Ages, Persona 4: Golden