Can't Understand

Again I am confused about bad reviews on goodreads about You Have Seven Messages.  Some folks were disappointed that it wasn't a mystery book.  Well I am not sure what reviews or descriptions they read about the book, but I never thought it was going to be a mystery.  It is definately a coming-of-age, self-discovery story.  The mystery part is just like life...there are mysteries in life, but not all are Sherlock Holmes kinds of mysteries.
The deal is that Luna's mom is killed in an accident on a NYC street corner, not the driver's fault, she ran right out into the street and was hit by a cab.  A year later  Luna finds her mother's cell phone, with seven messages.  As she listens to them she understands that there was more to her mother's death, and her mother's life, than she thought.
This is a good book for sure, not a mystery to solve, but rather it addresses the mysteries of life like how does love work?  How does falling out of love work?  How can you love someone even though they hurt you?  It's about learning how to live in the grey and that's hard to do, but necessary.