Glosslip (god I love that woman) posted a detailed exchange between Amazon and a book reviewer whose critical review of Scientology was removed multiple times. I really think you guys should read it.
GlossLip » More Scientology Censoring: Amazon.com Review Guidelines Disallows Critiques Of Authors Or Their Intentions
As a published author with a book on Amazon, it would be unthinkable that I would expect Amazon to bend over backwards to erase any negative reviews of my book as they are apparently doing for Scientology.
This stuff is
really getting scary, and people should know.