For me, there haven't been too many disappointments this year. One of the advantages of not being able to play that many games. I do sometimes feel like the only person alive who doesn't love Fable 2.
edit: Also the rest of my list:
GTA IV
Rainbow Six Vegas 2
Madden/NCAA - have become yearly disappointments. Every year praying they'll bring back the magic last gen's games had.
edit: Also the rest of my list:
GTA IV
Rainbow Six Vegas 2
Or is that 1.5 har har