Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Oh I can't believe I wasted so much time on this!

This book is nonsense from beginning to end. The protagonist is entirely unsympathetic and tiring. I kept thinking that the answer will finally be revealved and then I finish the book and I just felt that I had completely wasted my time. What on earth was this book about? I am irritated with myself for investing so much time in this nonsense!