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

Now, solve this: I ordered this new knife from Amazon based on the Laguiole name, prior Sabatier experience and the one review (5 stars). What a disappointment! One side of the blade had very visible tarnish and reddish blue spots (not sure whether rust or previously used). It also has a very light and extremely cheap look with poor manufacture. It is made in France, but it goes to show that junk comes out from there just as easy as from China, Pakistan or anywhere else. True you get what you pay for, but this one wouldn't be worth even 2 bucks at a yard sale. Maybe it was a defective unit, but I didn't want to take a chance with a replacement. I never even tried to use it, and simply returned it. To Amazon's credit, their return process was great. Just follow the online "return" process, print the (free/prepaid) return label, and take it to any USPS station. Amazon's service earned the second extra star.
Solution:
Negative