Confirmed!
Every Mercedes made the "Least Reliable" or Reliabilty Less than average list.
Besides that it looks like Audi and BMW are on their way as well.
From Yahoo: "Less reliable than average were every model by Mercedes-Benz, Audi, Jaguar and Land Rover. Those are luxury brands whose prices can run past $80,000. BMW did better. Only its $70,000 7 Series flagship sedan and $41,000 X5 were worse than average."
A link to the results:
http://www.usatoday.com/money/autos/2003-11-03-reliablechart.htm