Admittedly, I'm not a member of the target audience for this movie. Nonetheless, I did see it recently and had a few thoughts. The premise behind the movie - that a guy meets a princess who turns out to be a magical guardian of fairy-tale animals - is cute and has potential. However, it ultimately falls short. It seemed too quick (and indeed runs less than an hour and a half) and never took full advantage of the fairy-tale creatures at its disposal. There were no magical moments with unicorns (although there was one with a fairy baby). The movie could have been extended by half an hour or so in order to play up the fairy-tale aspect. Right now, it's too similar to any other ABC love story.
Another concern is the appropriateness for kids. Some reviewers have noted one of the characters uses words like gay, lesbian, and virginal. While those certainly aren't appropriate for a kids movie, I was more disturbed by the portrayal of marriage. The main character's best friend seems to constantly complain about his marriage and the responsibility of having a baby. Fortunately, at the end of the movie he seems to have forgotten about his problems, but it was still unnecessary and doesn't portray marriage well.