UPDATE: Dennis Laurion wins with free speech defense to Dr. David McKee's defamation lawsuit.
#1--Patient Susan Walker was able to get Dr. Aaron Filler's defamation lawsuit thrown out of court. See: California patient wins anti-SLAPP motion against doctor she criticized
#2--[SEE UPDATE ABOVE!] Dennis Laurion is still fighting this defamation case by Dr. David C. McKee: See: Dr. David McKee sues patient's son for Internet defamation, hires a private detective to find out which nurse called him a "tool"
"When a doctor hires a private detective to find out which one of the 4,400 nurses in St. Louis County, MN may have called him a “tool” you know the man is serious about defending his reputation. That is just what Dr. David McKee of Northland Neurology and Myology is doing in preparation for the next leg of his defamation lawsuit against the son of a former patient, Dennis Laurion..."
The irony of all this is that is is perhaps more likely that positive reviews are false than negative reviews.
Here's an Aug. 25, 2012 New York Times article by David Streitfeld about how reviews are bought and sold:
...“The wheels of online commerce run on positive reviews,” said Bing Liu, a data-mining expert at the University of Illinois, Chicago, whose 2008 research showed that 60 percent of the millions of product reviews on Amazon are five stars and an additional 20 percent are four stars. “But almost no one wants to write five-star reviews, so many of them have to be created.”
Consumer reviews are powerful because, unlike old-style advertising and marketing, they offer the illusion of truth. They purport to be testimonials of real people, even though some are bought and sold just like everything else on the commercial Internet.
Mr. Liu estimates that about one-third of all consumer reviews on the Internet are fake. Yet it is all but impossible to tell when reviews were written by the marketers or retailers (or by the authors themselves under pseudonyms), by customers (who might get a deal from a merchant for giving a good score) or by a hired third-party service.
The Federal Trade Commission has issued guidelines stating that all online endorsements need to make clear when there is a financial relationship, but enforcement has been minimal and there has been a lot of confusion in the blogosphere over how this affects traditional book reviews...