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See it if you love classic Broadway musicals, and enjoy seeing what other musicals were inspired by. It's a dazzling piece despite it's flaws.
Don't see it if you hate creepy love stories/don't like being scared by certain things like loud noises and pedophiles in masks.
See it if you love musicals that simply remain in your heart forever. Also, there are many hints to the fantastic novel by Hugo.
Don't see it if you hate all-singing musicals. There is NO dialogue. It's also very long, and gut-wrenching.
See it if you love the Disney film, and love being mesmerized by both actors and set pieces/special effects. Not to mention COSTUMES!
Don't see it if you hate predictable theatre. The story is very predictable, but just SO good if you love it.