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:
For the cost, this puzzle is not well made. The pieces were locked together so firmly that the puzzle was very difficult to get apart. The edges had visible splinters, and over the course of a few days, the tray warped to the point that it doesn't sit flat on a table. The edges of the image on the pieces began to fray immediately as the puzzle was taken apart. To make the puzzle usable, I had to spend 15 minutes sanding the interlocking edges, placing a slight bevel on the bottom of each piece. I then rubbed a white crayon on each edge surface. This made the puzzle easy to work for my 2 year old grand daughter. On the plus side, the image is bright and colorful, and the puzzle is simple enough for a toddler to work. Considering that the puzzle is made in China and probably cost next to nothing to produce, they could have spent a few minutes finishing the edges of the pieces and lacquering the image so that it is more durable.
Answer:
Negative