movies

I'm just wondering, what makes a movie good?
Is it the editing?, but not too much editing or people start whining?
Frags have something to do with it, but there are some movies of less good people who are good too.
Is it the music?
Everybody has his own music style so who knows.
Or is it the length?, too long, to short...
Give me some backup here :)

let the flame war begin

*(btw i still need a good song for a fragmovie (bit like get quaked 3)*