Here we glimpse a possible fusion between the turgid routines of MoveOn.org and the filmic standards, if not exactly the filmic skills, of Sergei Eisenstein or Leni Riefenstahl.
To describe this film as dishonest and demagogic would almost be to promote those terms to the level of respectability. To describe this film as a piece of crap would be to run the risk of a discourse that would never again rise above the excremental. To describe it as an exercise in facile crowd-pleasing would be too obvious. Fahrenheit 9/11 is a sinister exercise in moral frivolity, crudely disguised as an exercise in seriousness. It is also a spectacle of abject political cowardice masking itself as a demonstration of "dissenting" bravery.
He gets more specific -- read the whole thing. Link from Lileks.