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:
The Eurorack was purchased as a portable mixer to tie mics into a camera. The inherent noise in my particular mixer is completely unacceptable. At a very reasonable level using balanced connections the mixer unmistakably colors the sound with a clear sounding "HISS". Even when running on batteries and far away from any electronic device the HISS is incredibly loud! Totally unacceptable for my purpose. The unit is now stashed away in a closet, a washed up waste of time!However for those on a budget who desire much greater quality with fewer inputs I HIGHLY recommend a Mackie 402-VLZ3 Four-Channel Compact Audio Mixer. However sometimes fewer inputs are unacceptable. Whatever the case steer clear from behringer!
Answer:
Negative