The graph above was posted by Galley Cat as an illustration of how readers should understand the star ratings on Amazon.
It makes a good point. If there are almost as many 1-star ratings as there are 5-star ones, you need to beware of blindly believing the good reviews.
On the other hand, once in a while, unknown readers do actually give 5-star ratings to books they really enjoy, so once again we have the problem of everyone being tarred by the same brush.
How do you feel? Are you looking at reviews differently now?