See it if You want a funny show with two strong leading men, one of whom plays multiple parts.
Don't see it if You're bothered by multiple murders or dislike English music hall.
See it if into a budget-minded version of a dark Broadway hit. Great-to-decent performances, well-cast leads, entertaining throughout.
Don't see it if well... it is a regional-theater-type production, and some dialogue is hard to hear, but it is creative and fun.
See it if Comedic musical that is intriguing and fun
Don't see it if Comedic musical with fun mystery involved