Give me back my GOOGLE™ is a Google front-end that's designed to screen out the morass of software generated and fraudulent 'review' sites that now infest results of a product review search. The author uses a basic blacklist approach. Yahoo! had a similar product that allowed one to bias search away from vendor sites.
I hope Google is figuring out how to get rid of these lice, but in the meantime it's nice to see prototypes for future solutions. In the meanwhile I use Amazon for review information -- if you sort for lowest ratings first then read up you get excellent product information. If you're a hardware geek, the newegg.com reviews are quite good as well. Then there's Ars Technical, Tom's Hardware, limiting search to bloglines subscriptions, etc.
So it is possible to find good product reviews, but Google isn't yet part of the solution.