This looks like a case of a classic schizophrenic Hollywood movie--too dark-humored for fans of romantic comedy, not nearly outrageous enough for those looking for that quality. (You may get a little nervous, though, when a shotgun-wielding character walks into a fast-food restaurant full of kids.) Consequently it will end up alienating a lot of viewers looking for the one type of film or the other. Most of the characters aren't very enjoyable to watch, with the noted exception of Drew Barrymore in the lead. I was disappointed that Catherine O'Hara's part wasn't any better--she could have really livened the movie up if her character had been a little more forceful.
Despite all the problems, there was still something left to like here, and I would give it a positive recommendation, but just barely. On second thought, recommending this movie to someone would be a risky proposition, but I thought that overall it was marginally successful.
