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: WARNING!!! CAUTION!!! Parents do not waste your hard earned money or valuable time with this toy. I am the proud father of two boys who were so excited to receive this batcave from Santa. Boy were they disappointed with the substandard quality. This has to be the worst display of a children's toy that I have seen in awhile. I feel that Mattel has stolen from me by misrepresenting this gypsy junk as an actual toy. Please do not purchase!
Solution:
Negative