I think that is part of the problem....you think that stuff was added based on the movie(or taken away). I would like to point out that the Book is both the source for the movie and the musical. your review sounds like you think that the book is the source of the film and the film is the source of the musical- not so. The musical actually tells the story more closely to it's literary parent. the songs are actually lyrics from the book (unlike the movie)and the characters are multilayered as they are in the book. Mister was not completely evil, and Celie didn't go from some timid repressed woman to some force to be reckoned with....
I can appreciate your review as someone who has studied acting, but I would see it more objectively if you talked about the acting criticisms you have with TCP, or if you actually talked about parts you wanted left out of (or included) in the musical. Talking about a scene from the movie is not a fair criticism of the musical, and just saying you expected more is too broad....I could care less about whether you have characters names right, but it does matter when you decide to be very general in your critique, but specific in your wishes.
Your Potential is greater than your problems, and your problems will bring out your potential- Vashti Murphy McKenzie.
Honey...don't be ashamed, be comfortable with who you are. Stay true to yourself.- Elisabeth Withers-Mendes