Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
One example: I've read this book with much expectation, it was very boring all through out the book
Solution is here: Negative
Explanation: Review writer does not like the book because it was boring, therefore it is a negative review.

Now, solve this: This is the wonderfully engaging tale of how Bugliosi successfully prosecuted the Manson Family for the August 1969 murders. However, if you wish to learn a lot about the backgrounds of the "family" members, this is not the book for you. This book is from a law-enforcement point of view. If you pick up this book hoping to learn about Manson and his philosophy, you'll be disappointed. However, if you want to know how the players were implicated and prosecuted, there's no better book.
Solution:
Positive