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: This may be the best product out there ... I wouldn't know because I had no idea what I was ordering. It didn't dawn on me when it said pneumatic that I had to have an "air supply" ... plus it doesn't have any grinding points. I just wanted something to etch my name on the metal prints of my artwork. So back it goes and I'll look for something that's simple enough for me to understand what it is and how to use it.
Solution:
Negative