Germans tend to think their stuff is perfectly engineered and everyone is an idiot. Seen that way too many times.
I've been away from VW for lo these many years (thank dog) but man the weirdness still haunts my nightmares. Many of the following were problems back then but still plague the Mercedes I see every day: poor grounds, cheap metal connectors that lose their grip when heated, wires which are one color in the wiring diagram and something completely different on the car, sockets and lamp housings which warp due to bulb heat, switches which are so fragile they literally explode when operated, I could rattle on for a while.
Getting off of electrical for a minute, I see (and a lot of this is on later model cars through at least 2008):
transmission control units which fill with ATF due to poor sealing of the transmission wiring connector (the unit in question is in the control box main mounting area in the right rear of the engine compartment, meaning the ATF has to travel nearly 6 feet in a linear direction and 2 feet uphill to get there),
poorly designed cowl drains which causes them to flood in a heavy rain which pours water into the blower housing leading to all sorts of nastiness,
$15.00 A/C servo levers made of what seems to be spun sugar which require a 10 hour dash removal to access,
random shutdowns due to various software problems (many of my customers are used to coasting to a deadstick landing on the side of the road to cycle the ignition so it will run again),
Airmatic struts which barf with alarming regularity,
112 engine timing chain idler gears which wear out prematurely (50-60k miles) filling the engine with all sorts of metal shards,
cables and control units on sunroofs which break while opening it (of course now you can't close it),
diesel ML's which have the throttle actuator motors disconnect themselves from the linkage at highway speed causing the engine to drop to idle with no way to get rolling until you pull the intake to replace the 75 cent plastic connectors that are 3" below the turbocharger and have no heat shield,
trim stuff that fits nice at first but pops off like Mercedes bought all of GM's leftover 1970's plastic interior clips,
convertible top cylinders and hoses which are poorly placed and poorly routed. Anybody out there have a CLK 320/430 convertible? Pull the headliner back at the center 'hinge' point for the top frame (midway along the top of the door glass) and look at the routing of the plastic lines. Then look at the plastic clips which hold those lines in place. Word of advice: you don't want to wear a real nice suit in one of those cars.
German engineering my ass.