Instruct: Classify Amazon reviews into positive or negative sentiment
Query: bad psychology!

While fairly well-written for the thriller genre, this book contains some of the worst use of psychology I have ever encountered since the early '40s, when people really believed that hypnosis was this terrifying, all-powerful technique that could drive anyone to do anything. However, the science has since then progressed and even we the hoi poloi now know better. The most cursory research should have informed this author of the basic unsoundness of his murder method. His insistence on its use grated on my nerves and utterly destroyed any enjoyment I may have derived from the book. Characters are badly fleshed-out, awkwardly motivated, and flatter than a stack of pancakes. I guessed the murder's identity and the murder method one-third way through the book, thought to myself, Nah, it's too ridiculous, flipped to the end and Lo, I was right! What a waste of time.