The problem with The New Mutants is that it fails in so many different areas that's its difficult to pin point why it's such a bad movie. If you're a X-Man fan you'll be disappointed by the main characters mutations, if you're a thriller fan you'll be disappointed by the villain.
When to watch: The only scenario I would recommend you watch this movie is if you are die hard fan of one of the actors (Even still you might be disappointed)
How to fix this movie:
<ol>
<li>Replace the villain, stop trying to make this a weird horror crossover and focus on what made X-Man good to begin with. A PROPER VILLAIN.</li>
<li>Far to much focus on the poorly written backstory for each main character.</li>
<li>Make the Mutations better! The super powers should make the audience want to be them.</li>
<li>Cut the cheesy dialogue and pick a clear genre, this is a toss up between, Sci-Fi, Action, Horror, Romance, Cheesy B Level Movie.</li>
</ol>