Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Slater's World War Three series is terrible

I have all of Slater World War III novels and I have read them all. They started out interesting enough, but with so many factual errors and grammatical mistakes, they were very frustrating to read. Worst of all, the characters were flat and uninteresing. I'm going to get rid of all my Ian Slater books as soon as possible.