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

Problem: I'm not a fan of sci-fiction, but really enjoyed it. I agree with other reviews that environment wasn't deeply described and there weren't any sophisticated characters, but this didn't disturbed me, because the storyline was fast-paced and interesting. I couldn't put this book down before it was over.
Solution: Positive