To calculate the overall star rating and percentage breakdown by star, we do not use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
I do not like to give negative reviews, my sister wrote books, so I know how dear and personal the writing can be; however, I have no idea why the publishing editor or her friends who edited did not catch all the redundancy in the book. It was annoying to read a paragraph to have the same thing said in a different way 2 paragraphs down. This happened pretty frequently.