Actually, in the early 'eighties, the Mercedes W123, 5 series BMW and Jaguar XJ-6 all offered a better ride/handling experience than anything else you could buy. There were also a handful of grey market Citroens, which were remarkable cars.
Now, GM did remarkable development on some sow's ear platforms. For example, the rudimentary Chevy II platform was morphed into the really good mid 'seventies Trans Am and the original Seville. Really pleasant cars, built on a really basic platform.
I drove a number of both (I was repossesing them). The T/A was a far more plesant car then the concurrent Corvette, had equal cornering limits, and was virtually as fast. The Seville was no Mercedes, but was quiet, and rode well. Most of it's buyers, like most MB W115 or W123 buyers, would never explore it's limits.
The '77 GM B-bodies were also very good. A Chev Caprice equipped with F-41 suspension was a worthy adversary for any sedan then available from anywhere. My family had a couple of them.