Ever since Pixar started making movies all of Disney's movie have been on a downward spiral.
In Valiant, the title role is a pigeon, voiced by Ewan McGregor, in the 1944 wanting to join the Royal Homing Pigeon Service to help the war effort. After basic he sets off on a mission to deliver a message from the French mouse resistance back to England and away from the Nazi falcon's from learning its secrets.
While the voice work is top notch, employing Ewan McGregor, Tim Curry, John Cleese, and Hugh Laurie; they don't really add much to the bland and unfunny writing that kills most of the movie.
Art in the film is good and fluid and music is also par for the setting.
Valiant is one of a long line of Disney films that doesn't live up to the name and can be enjoyed but not by me.