Mercedes wouldn't publish it, but just from looking at these forums and from personal experience, I'd guess more "problem" Mercedes come from Alabama than Germany. Lot of it has to do with the subcomponent suppliers, I'm sure. My first inclination would be to not dismiss the work force as typical UAW..
Than personal experience can be very misleading in general statistics.
Our ML320 in 11 years generated $150 in repairs, while "German build" sedans about every other year need "$500 here, $1200 there"
You can tell that fact that only ML is our original car makes a difference, but frankly in last 3 years our son is abusing it pretty much, like he basically killed 3 cars he drove before.
Than not too many native Germans build MB in Germany. Some might be surprised seeing Turkish, Polish, Czech and probably in last years Ukrainians building the highest quality bolids.
On W211 I've seen parts labeled "Made in Czech Republic" in several places.
You can say that immigrants in Germany learn the German discipline, but wasn't that Americans in last 8 years who blindly followed the leaders straight into economical hole?
IMHO what gave ML bad wrap is fact that it was technological break-through on US market. Priced very low the first mass-delivered "wheeled computer" was letting LAZY US MECHANICS to learn new technology on customer wallet.
I would be very interested to hear how the plant in Alabama is doing? On this market when lot of auto plants are idling, we don't hear about MB too often.