Really sorry to hear that mate - must be very frustrating to say the least !
Can only speak as I find and this is now our 6th VW in a row (3 Polo's, 2 Golfs and a Scirocco), and apart from a climate control panel needing replacing under warranty in the MK5 Golf and the door's adjusting on the Scirocco (frameless windows and wind noise at speed), all 6 has been pretty much bullet proof (touch wood), and as a brand my opinion is that they are certainly up there with the best marques.
As usual what let's them down is the UK agent (VW UK - totally clueless) and mainly apathetic dealers (although there are so good ones out there). Get those two sorted and I think it would cure most problems.
Whilst no manufacturer is ever going to produce cars that are 100% perfect 100% of the time, I do think what you are experiencing is well beyond what might be expected to be reasonable, and certainly the "Friday Afternoon" car syndrome springs to mind, but TBH, I thought that was a thing of the past with mostly fully automated production lines ?