Having owned a car which was more trouble than it's worth (top of the range fully loaded Renault Laguna) and was in the garage more than on my drive, my Mercedes is a shining light of good build quality after that.
It has however made me a little more tollerant of the fact that cars can and do go wrong. All cars have their faults, no matter how much you spend on them or who makes them - I'm sure there are Veyron owners with issues.
What makes the difference is how the problems are dealt with when they occur.
My MB has to date been problem free. Yes, it has a couple of niggles (like the injector noise and gearbox hesitation) but as far as I am concerned they are minor and the car is still spot on.
Since I took delivery in March it has been to MB once - at my request - for a sat nav update and software update to ECU. My last car had a major gearbox rebuild (which they screwed up and had to fix countless other things as a result) and at least one major visit to the dealer every month by that point!
The visit to the dealer was faultless and the experience good.