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:
Let's keep this simple: promising plot ruined by -Bad acting.Poor and often ignorant dialogue (scripting).Inconsistent plot elements (slow walking zombies, then fast ones, then back to slow).An inhabited island overrun by zombies, yet not a SINGLE boat was available anywhere.Piss poor directing.What else is there left to say?
Answer:
Negative