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 lights that I received are absolutely not as pictured. The product description is vague if not poor.The lights received are much smaller than in the photo (an inch in diameter). They are useless as illumination. I live in a high-sun area and have placed the charger in a position where it gets sun from dawn to dusk. The cord from the charger and the lights is long, which allows you to place the charger on the roof. In the end they are not worth the price.
Answer:
Negative