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: The eMarker is a wonderful and innovative idea. The size is right and the price is reasonable (a little cheaper would be nice, but its acceptable). The big problem stems from the fact that Sony has no Mac support... or support for a number of other platforms as well. It's not like its hard to make the eMarker compatible with these systems. Sony is only shooting themselves in the foot. If this product were to support the Mac, it would be a 4 or 5 star product.
Solution:
Negative