...and I was specifically referring to the discussion here:
http://www.autos.ca/forum/index.php?topic=92183.msg1086478#msg1086478
So you wouldn't buy an A4 because of that generation of S4.
It's a matter of trust. No doubt the least reliable manufacturer makes some components, or even whole vehicles, that tend to outlast those made by the said-to-be 'bulletproof' manufacturers.
While I believe my RX400h to be 'bulletproof' at 9 years old, I am thoroughly unimpressed by my current Corolla at 4 years. This is despite the fact that no major components have failed in the 'rolla. I am concluding that Toyota's newer products as less reliable than the older ones. I also attribute this to location of manufacture (Cambridge vs somewhere-in-Japan).
On that basis, Audi's failures have not been 'minor', but catastrophic in nature. That's on the higher-end models as well, which concerns me. I would be thinking over and over again about 'reliability' before dropping serious cash on a VW group product.
If, on the other hand, 5-8 years from now, I read of no massive recalls or failures, I would again look to them.
...much in the same way that I was, prior to the 1.6T, willing to look at Ford again, and I am considering a Buick.
...and much like all your comments, if VW did indeed turn itself around in 2008, then in 2017 or 2018 I will review everything and consider again.