I have to say, my experience is quite different. My Monaro has been put together beautifully and is actually the most reliable car I've ever owned and I've owned 3 Lexus

I've also had 3 VE Berlina and Calais work cars and they had many more issues, luckily under warranty. The general quality of the VE was certainly not better than the Monaro and I got them new. Never had a VF though.
For my Monaro, that I purchased new for myself, the issues with the factory stuff is limited to a replacement radiator, and needing the radius suspension bushes replaced. The radiator was more related to how much the car sits around now, started to leak. Although, the original lifters did go but that was with an aftermarket cam that was very hard on the valve train. I can't blame Holden for that.
So, including that, everything else that has caused me grief has actually been performance bits I've added, e.g. I'm having issues with this stupid UDP belt squeaking (and I can't work out what the right replacement is).
However, my big concern is wear and tear items like CV8-R mats and gear knob and in particular, if the car is damaged. Getting stuff like the CV8-R specific headlights and tail lights, badging etc. Impossible, even second hand which I don't want but no choice. Even Monaro drivers windows are apparently impossible to get new now. Scary stuff!