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:
A wonderful, exciting adventure in the best HD I've seen so far. Whomever said any of these movies was "grainy" didn't watch it on a TV as good as my Mitsubishi Diamond Series.The story was great and endearing, the casting was great, Spiderman was perfect and the HD was breataking.This is what good movies are all about: telling a story, using artistic means to do it, and have a great cast to do it.And, of course, the ending was great too.
Answer:
Positive