I read reviews to see what others may think of the book or product. After reading the review good or bad I will decide if the product is something I want to invest in. I do not just depend on the review to determine if I will make the purchase. My interest and the person the wrote the review maybe very different. If I am already a little concerned about the quality of the product the review maybe all I need to decide not to purchase the book or product. I was interested in a book recently but after reading the review I decided it was not what I wanted to read to much killing for my taste.