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 like the book just because it was fun to read, but very skeptical about the way the writer admits he had seen ufo sightings night after night in chapter 10 of the book. My question is why in the world a guy like John Keel arms himself with only a flashlight and not a camera. He obviously sets himself up to see strange lights but does not bring a camera to capture the event. Unless he makes a book that has pictures for us to examine, and not hording all the evidence for himeself. Then I will have put him in the "Good story teller" catagory and not a "ufooligist". I must admit I am tired of all the hidden evidence about this matter, and I think we are all ready for the truth. If you want my opinion I just threw all his credibility in the bin. I must admit I really enjoyed this book.
Answer:
Positive