As a Tesla Model S owner, and former BMW owner, I can say without a doubt that the german build quality (BMW, Mercedes, Audi) is superior to Tesla.
However driving a Tesla feels like having the first iPhone, and everyone else is driving around in Nokias. The Mercedes S class does however come close, in my opinion.
Well, my last 4 cars have all been VW Group (Passat, Golf, Golf, ŠKODA Yeti) and I've never had any problems with them - mind you I kept them for 3 years so they were all within warranty.
Worst electrical problems we've had was with a Toyota my wife had - problems with the sunroof caused the instrument panel to fail!
neither BMW nor Mercs are in VW group (and god thanx for that!). Audi is, and generally, within those 3 brands, is considered as the cheapest, least luxurious, least fun alternative (R8 is an exception :))
However driving a Tesla feels like having the first iPhone, and everyone else is driving around in Nokias. The Mercedes S class does however come close, in my opinion.