I noticed a fair number of "bad" (by German standards) drivers on the southern Autobahnen over the past few weeks, but they were mainly non-Germans; I'm 99% sure the drunk guys in the 15 year old Honda were US military, and by the plates, most of the other bad drivers were also not German. So it's not foolproof, but still the standard is far higher, and the roads are well maintained.
What I noticed most acutely was the lack of objects-in-road, vs. California. Not sure if that's due to the general lack of pickup trucks, people hauling junk, etc., or due to laws/training/maintenance.