Being a self-proclaimed "buff" I submit the following:
The excellent:
1) Slumdog Millionaire
2) Frost/Nixon
3) Dark Knight
4) Gran Torino (almost got the bump to good)
The good/decent:
1) Pride and Glory (had potential to be excellent, missed the mark)
2) Doubt (almost made excellent)
3) Defiance
4) RockNRolla (a niche film for sure, but plenty of content to keep most interested)
5) Quantum of Solace
6) Taken (almost hit mediocre, but Neeson did a superb job)
7) Curious Case of Benjamin Button (good is being generous - this probably belongs to mediocre)
8) Role Models (horrible message, albeit hilarious)
9) Valkyrie
The mediocre:
1) Push
2) Paul Bart Mall Cop
3) Body of Lies (far too predictable and "meh" performances all around - I never felt engaged in this film)
4) Seven Pounds (arguably Will Smith's weakest role to date)
5) Righteous Kill (almost bad - you would think that with De Niro and Pacino you could do better)
The bad:
1) Most new cookie-cutter horror films.
2) The Day the Earth Stood Still
3) Twilight
5) Unborn
6) The Uninvited