For movies, IMDB average scores are <i>exclusively</i> between 5 and 8: a Four Point Scale. In contrast, Rotten Tomatoes and Metacritic scores hit the full gamut reliably: (I wrote a full statistical blog post on this with visualizations: <a href="http:&#x2F;&#x2F;minimaxir.com&#x2F;2016&#x2F;01&#x2F;movie-revenue-ratings&#x2F;" rel="nofollow">http:&#x2F;&#x2F;minimaxir.com&#x2F;2016&#x2F;01&#x2F;movie-revenue-ratings&#x2F;</a> )<p>I did a similar thing for Amazon reviews many years ago but it was not very insightful. (<a href="http:&#x2F;&#x2F;minimaxir.com&#x2F;2014&#x2F;06&#x2F;reviewing-reviews&#x2F;" rel="nofollow">http:&#x2F;&#x2F;minimaxir.com&#x2F;2014&#x2F;06&#x2F;reviewing-reviews&#x2F;</a>)