The film's depth (or lack therof)
Perabo plays a thoroughly winsome heroine and the movie's fun with a kinetic soundtrack (with, for example, "Pour Some Sugar on Me" playing twice). After the first act though the movie never really takes off and the story becomes predictably bland, albeit still somewhat entertaining.
The biggest problem with "Coyote Ugly," beyond the story being predictable, is that there's no meat on the bones (even the girls need to eat some hamburgers). Take the subplot with the boyfriend and his big revelation scene; it was underwhelming and weakly executed. Moreover, I just saw the movie last night and I can't even remember if the protagonist "makes it" in the music business at the end. That's how forgettable the film is.
A couple of years after the flick was released my wife asked a 9 year-old girl what her favorite movie was and she enthusiastically said "Coyote Ugly!" That tells you something about the film's depth.