I think dealers are generally pretty aweful. I found in the UK and US any experience i've had with car or motorcycle dealers has been very bad. Although living in germany visiting the shop with my motorcycle was a shear pleasure. may just have got lucky?
Many, many years ago, my first purchased car was a VW camper. I picked it up in Germany and watched them perform the service over there. I was VERY impressed with their care and knowledge. As an example, I watched the guy pulled the hand brake several times and releasing it. I asked him what he was doing and he said the spec for the brake was that it could be pulled just 3 to 5 clicks before it would be set. He was checking that and if it wasn't in that range, he would adjust the brakes.
By contrast, when I brought it back to the US, the first service I asked the guy what the spec was on that hand brake and he said, "If it holds the car, it is set right."
On meeting a German mechanic in Holland, he said they had pretty tough schooling requirements to be a mechanic. He had to take a couple of years of mechanic training after high school.
In the US (at the time at least), to be a mechanic you probably didn't even have to graduate from high school and I'm sure there was no mechanic's school.