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 borrowed a friend's copy and listened to this version. Madonna has a beautiful voice but it is too light for this role. Antonio Banderas is woefully inadequate in the singing department. Do yourself a favor and don't buy this recording. Buy the original Broadway cast C.D. with Patti LuPone and Mandy Patinkin. It is by far the best version.
Answer:
Negative