Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Let me give you an example: I've read this book with much expectation, it was very boring all through out the book
The answer to this example can be: Negative
Here is why: Review writer does not like the book because it was boring, therefore it is a negative review.

OK. solve this:
I thought this book was magnificent. The way Vincent Bugliosi described everything in such depth. I found some of it to be dragging in the beginning, but am I glad I didn't give up on this one. The chilling reality is what got to me the most.
Answer:
Positive