I think it depends on the specific car. My mom's C5 'Vettes and my fourth generation F-bodies held up great, some over 100k miles, without a single non-scheduled maintenance trip. Then again, my 2 year old Grand Prix GXP, with just over 20k miles, is already showing signs of a variety of problems. Some of my friends, who drive mostly imports, have reported the same variation in quality from model to model. I'd love to see some unbiased statistics on this to see what the truth really is, but I doubt you'll see the same level of quality across any company's entire product line.
I've decided not to buy from GM ever again, but that's more due to their handling of the situation with my GXP than any perception of inferior quality. Still hoping I can trade up to a 'Bluestar' once Tesla gets that far...
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