Take a look at this site: http://www.dealerrater.com/
It is a dealer rating site, multi-national, multi-branded, and apparently gaining in popularity quickly. The first time I logged on there were very few Mercedes postings but now there seem to be expotentially more.
All those happy and unhappy Mercedes owners now have a site to Rate the Dealers on sales and service. Come on folks, let's generate some numbers and increase the credibility and value of this site. The dealers need to know that we are watching, taking notes and communicating!! Public positive and negative feedback is the key!!