Production quality is a reflection of the manufacturing process and materials, not the country where the factory is located. All the engines will be built in germany and be shipped over. If they can mimic the quality control and factory processes they did in spartanburg, it will be fine.
The reason VW's are about as reliable as banana peel is b/c parent group VW/AUDI is a shit company for reliability, whether the car is made in germany, us, mexico, russia, china or wherever.
It does make me feel good that my X5 was built in the states, and that is unfortunate that they didn't choose a plant site here in the US.
2014 335i RWD: ZMM, ZDA, ZDH, ZPP, ZTP, 2NH, 2TB, 5DL; Z4A MPPK; AW ext / VB int
2014 ML350: P01, R33, 297, 319, 846, 864, 889, 996; LB ext / AB int