Amazon calculates a product's star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers and factors that establish reviewer trustworthiness.
It is much better to listen poems on youtube rather than then to purchase it. It is not worth to spent money on the book. This is my personal opinion, that reading poetry in the book does not give the actual feeling of joy,