Originally Posted by BearMountainBooks
A blurb is a form of advertisement just as a review is (whether the reviewer intends it that way or not. It can be a negative recommendation, in which case it is like a negative political ad--telling you not to buy.)
Blurbs are endorsements. Reviews are intended to be critical evaluations of the work, according the reviewer's standards. A review is not an advertisement.
Would you equate an political editorial in your local newspaper with a TV ad from a political action committee?