Our critics appear to be less educated than our fans
priceonomics.com
priceonomics.com
It could be that their critics are idiots, but this isn't much evidence. (And I'm pretty sure they're joking.)
The 'intelligent' reviewers may write one star reviews on other books that are legitimately bad books.
If anything, you could use this API to calculate a "True" amazon book review, in which you could identify the reading level of the reviewers and weight their # star review accordingly. I might give a crack at this later because I spend so much time trying to decipher Amazon's reviews regardless.
And can they apply this to Netflix?
They de-emphasize how 2-star reviewers are more intelligent than 3-star reviewers, or how their readership will be skewed toward those who already liked their work.
[1] to the extent measured by this proxy