Jen Doll examined the logrolling world of book blurbs today. One of our commenters finds that blurbs critics are fine, but blurbs from authors are warning signs.  Jeremy Greenberg writes

Quotes from respected critics, I like. Quotes from respected critics on the quality of the translation, I really like.

Quotes from other authors: HOLY SMOKE are these annoying. I don't care if you're friends with a famous writer; that tells me nothing.  If a cover only has those blurbs I'm actually disinclined to pick it up.

Be especially wary of any book bearing a quote from Gary Shteyngart, one-man blurb factory. Some authors like A.J. Jacobs have even been coming clean about their prolific and unwaveringly positive blurbs lately.