I notice some people are rating books randomly, just to spoil someone's rating. I know those people did not read a book, otherwise, they would give an explanation for their reviews.
Be aware, as much you wish to ruin someone's reputation and sales, if the book is good, it will reach the audience.
Some profiles are here just to mark books with one or two stars. You are not experts, you are trolls.
If you wish to give a negative review, do it. Just, be professional, tell what you don't like.
The same is for people who are giving five stars around. Yes, we authors love compliments, but we want proof that you read the book.
Thanks for my 200 ratings, I appreciate your time.