No, wait! You guys are confused...
A1, A2, A3, A4 are designation names for platforms. For example, the original Rabbit (Golf) was an A1 car. The current Golf is an A4 car, as the Jetta, New Beetle, Audi TT, Audi A3 (never mind the designation -it is built on an A4 platform), SEAT Leon, etc.).
The "B" platform is the one the Audi A4 and the VW Passat use.
So my car is an Audi A3, riding on a VW Group A4 platform, which has nothing to do with the Audi A4 one. Confoosed?
Anyway, about the quality issue... there is a specific quality control for VW cars going to the States in the Puebla plant. Those cars that don't make the cut end up being sold in México's own market (YOU SUCK, VW!). That's the reason I avoided VW in the first place, and bought a German A3.
But come on... my dad's car on the job is an old Sentra (2 generations behind the current one), it has 120,000 kms. in it, and all that has been wrong with it are the spark plugs, which had to be CLEANED (not changed!) 2,000 kms. ago. And my "quality" Audi has had so many problems I can only think about selling it now.
I might get a Sentra SE-R Spec V... or a Toyota MR2 (if it comes out in México this year), or a Civic Si... not bad choices at all.