See it if you enjoy an emotionally heavy play, you enjoy a combination of fantasy and realism, you love amazing acting.
Don't see it if you are sensitive to blood and nudity, you cannot sit for a long period of time (the play is 7.5 hours total).
Also (I saw it in previews)
See it if you enjoy theatre akin to traditional Shakespearean theatre, you are a fan of opera, you enjoy dramatic plays
Don't see it if you get caught up in little details, you dislike sudden changes in tone/pace.
See it if you enjoy a modern story, you are a fan of Pasek and Paul, you enjoy pop music, you enjoy sad or dramatic stories with a tiny bit of comedy
Don't see it if you don't like obvious lyrics, you are very concerned with excellent staging and choreography, you are sensitive to topics of suicide
See it if you love amazing sets and costumes, you enjoy great acting, you are a fan of My Fair Lady in general
Don't see it if you are expecting phenomenal singing, you are hard of hearing, you can't understand heavy accents, you are expecting a dance-heavy show
See it if you love excellent choreography, you enjoy dazzling sets and costumes, you love catchy songs
Don't see it if you are not a fan of old musicals, you dislike sudden changes of tone, you have EXTREMELY strong opinions about what happens after death
See it if you enjoy older shows, you enjoy love and matchmaking stories, you enjoy eye-catching sets and choreography.
Don't see it if you can't stand "cheesey" or overly sentimental shows