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See it if You enjoyed the film and want to see kids rocking out onstage. Also see it if you want a fun night of theatre.
Don't see it if You're looking for a classic musical, you dislike children or if you don't like Jack Black (the actor plays the role like him...)
See it if You enjoyed the movie, quality singing, being entertained and going on an emotional journey. Also, if you enjoy delightful magical moments.
Don't see it if You don't like Peter Pan (who doesn't like Pan?!?). And if you are looking for a splashy spectacle.
See it if You want to experience a great piece of theatre.
Don't see it if I can't think of any reasons NOT to see this show.