Depends on what you wanted out of a car 'back in the day'. Same as today, we think the cars are built great, but in 40 years people will talk about the 'crappy build quality' of today's cars. And we here now are complaining about some of the crap quality, so you know it'll be talked about in 40 years, IF ANY of today's cars even last that long. I have my doubts. Plastic doesn't last as long as steel.
In the '70s the cars stood up great for all the crap we put them thru.
Back in the 50s the cars were built great, same for the '60s, & '70s for the day. The '80s: no where nears as good a build quality, '90s getting better again. Kept getting better as the years came up with better technology. And so on.