Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

[Q]: I didn't like some of the plot twist, of a former leader of the Autobots but other than that it was pretty good.
[A]: Positive

[Q]: An extremely helpful gem on a complex subject of second century religious authority and textual use. For anyone serious about this period and the interelation of cultures, this book is essential. Is it complex and detailed? Of course, it must be to argue the point. Should you buy it? Yes, unless you want to keep running back to the library. I write this only after thoroughly disagreeing with the review above.
[A]: Positive

[Q]: This book vaguely breezed across history and went into various types of timber structures. The mortise and tenon joints that were illustrated were fascinating but not practical for a home builder.
[A]:
Negative