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:
Bought Photosmart 1100 three months ago. Loved it till it thought my color cartridge was bad. Now printer will not recognize any new cartridge. Seems there's a hardware bug that the printer will not reset a flag that indicates failed color cartridge. I've bought 2 new color cartridges and a new black cartridge. Called HP & they had me clean cartridge 3 times, power cycle, and even sent new cartridges. Analyst at HP very nice, thought... still the display flashes "Color Cartridge Failed" and "Replace Color Cartridge". Won't even print B&W. Dumb thing...
Answer:
Negative