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See it if you are a human being. This is one of the best shows I have ever seen. A true story - funny, heartwarming, and an occasional tear.
Don't see it if maybe you don't like music with a Irish lilt. There is no reason not to see this show.
See it if you like British comedy. And if you can sit through a confusing first act so you can get to the funny second act.
Don't see it if you can't follow British accents and British vocabulary.
See it if you are familiar with Hamlet and Shakespearean quotes. Or if you like Janet McTeer. Or if you like Shakespeare. Or if you like in jokes.
Don't see it if you are not familiar with Shakespeare. Too many Shakespearean quotes. Too may in jokes.
See it if You enjoy fun, music, dancing. Based on Shakespeare's Measure for Measure, but in a way even we non-Shakespeare lovers can enjoy.
Don't see it if Well, if you don't like having fun at the theater, you won't like it. Some folks enjoy serious drama and this ain't it.
See it if you like to laugh hard belly laughs. The sillier it gets, the funnier it gets.
Don't see it if you don't like slapstick. Actually, I don't like slapstick and I almost fell out of my seat laughing.