This film doesn't fit neatly into any genre so if you're expecting a typical super-hero film or a horror film, you'll be disappointed because it is neither. Of course more development is always nice but the "in media res" nature of the plot gives the story an economy of a short story. However, if you can just let this be a film about young people working through their own personal demons with the help of one another it may just have something to teach you.
Review of The New Mutants
