The folks over at Wired's Game|Life blog have listed their top 
disappointments from 2007.  They cover everything from the craptastic 
Two Worlds to 
Super Mario Galaxy with the biggest disappointment being the lack of quality games for the Wii (something Cyril and I have talked about in the comments and forums of the site).
It's a good list but if I had to add to the list I'd include 
Mass Effect (I love the game but the lack of spit and polish detracts from the game), the single player mode of 
Halo 3, the fact that 
Uncharted: Drake's Fortune isn't getting more love, and Microsoft Vista (I'm rolling my laptop back to XP this week).  
What were your big disappointments for the year?  Feel free to leave your thoughts in the comments.