Do you find Amazon.com book reviews are inflated?

Is it just me, or do number of stars given tend to overrate the quality of the book? If so, it is not hard to come up with possible reasons. People who enjoyed reading the book may just be more likely to review it than those who are disappointed. There could also be a bit of skulduggery going on, with authors or publishers recruiting people to give positive reviews. I now make a point of reading the negative reviews, even if there are not many of them, in order to get a more balanced view.