The last time that I had a flat tire was just before I put 10 ply tires on my Ford Ranger. A bit of overkill I'll admit, but I drive a lot of gravel roads that are hard on tires.While vehicle quality is way up, let's not forget what roads were like in the past.
Many of the roads I drive on today - nice smooth pavement - were gravel with potholes and washboards just 40 years ago.
Tires sure are more dependable now, too - when is the last time you got a flat? As a kid I remember changing flats right and left (partially because of the used tires we bought, but even new ones weren't fantastic). You can get a tire with an 80k mile warrantee now! I wouldn't, because I like traction, but I regularly buy 40k mile tires which actually get that and they don't hydroplane easily either.
I like the "don't make them like they used to - thank god!" quote, because it's really accurate.
I think that the oil today is probably better also, which has a lot to do with engine longevity. A lot of the repairs that people complain about are at mileages that most vehicles of 20 or more years ago didn't attain.
I found Moss' comment about scratching paint to be rather timely, as just last month our summer employee told me that I should be driving a Prius after I chose not to go pushing through the alders on a strange road, and on a separate occasion opted to unload the ATV rather than drive across a bridge which was obviously suffering from tired abutments.
Then again I probably knew everything when I was in college, also. Sometimes I can walk faster than I can drive, and he's never experienced that sinking feeling when the bridge gives way as you're halfway across it.