My prior experience with German cars, a VW Rabbit of late 70's vintage, was that it had many more problems with the fuel system than either of my current cars, a 90's Corolla and a 70's Ford truck. Not even close. And it broke down leaving me stranded on the side road more often than any other car I've owned.
And when maintenance was required, it was more expensive than any other car I've owned. Not necessarily a lot more expensive in every case, but definitely always at least somewhat more. So w/the later 70's German Rabbit anyway, considerably more fuel system problems and each of the problems cost more to fix. Add to that the possible danger of road-side break downs.
That's not to say the German Rabbit didn't have its upsides. The road handling was very good for example. Better than any of my other cars before or after.
Whether any of this applies to current German cars, who knows? I'd look to Consumer Reports for that info.