Given the task definition and input, reply with output. Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

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.
Positive