Instruct: Classify an Amazon review into positive or negative sentiment.
Query: a disappointing book

I bought this book based on other reviewers' comments. After reading the book, I am totally disappointed for the following reasons:1. it does not fit to the description of other reviewers. I am not sure we are reading the same book.2. it is a fast-food book with a lot of junk pictures that explain nothing the author try to explain.3. only 30% about M-commerce, and others about Business strategic stuff. I can read that from other expert on strategy.4. no clue what is the framework.5. you can get 5 times more good stuff from "informit.com" if you check the wireless link.