Of the 34 cars tested in the survey, German-built cars received only average points with Volkswagen, Land Rover and Smart owners at the bottom of the list.
Some 54 000 German motorists were asked to grade from 1-5 their satisfaction level with the car combining experience with the vehicle and workshop service.
Porsche had the highest marks at 1.2 followed by Subaru (1.22), Toyota (1.27), Honda (1.32), Mazda (1.37) and Mitsubishi (1.43).
The Russian manufacturer Lada had a surprisingly high figure of 1.46 points, taking seventh position overall. The ADAC said the owners of such vehicles also had minimal expectations from the car, expecting it only to take them reliably from A to B.
Expectations from premium car manufacturers were far higher with customers expecting good quality and service for the higher price. Mercedes was voted near the bottom of the list at 2.02 points. The Smart manufactured by the DaimlerChrysler concern was last on the list with 2.17 points.
In analysing the result the ADAC said the problem cars at Mercedes were the V-Class, the Vito, the G-Modell and Vaneo. The VW Sharan, VW Bus T5 and the Lupo also had poor ratings.