They rejected my review of Michael Moore's book twice, telling me I wasn't showing him "proper respect". The review was simply negative, not filled with vile words like so many reviews that they do so often include. So I do think they pick and choose reviews, and also "feature" ones that best present their own viewpoint.
Being an Amazon book review monitor has to be the bottom of the barrel for aspiring lefty writers....worse even than doing verbage for ELLE, GLAMOUR or VOGUE.