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:
This is my favorite of Jamaica Kincaid's, which of course is saying a lot. It is simply amazing. More complex and involved than her usual writing, it is a "hard" read, but definitely worth it. Also, if you ever have a chance to hear her read, it is amazing, and you will never read her in the same way again.
Answer:
Positive