The performance of the cars was so crap that the only thing they could advertise was the cool paint work and the amenities. And it was GM, Ford and Mopar were just as culpable, who felt they couldn't do anything wrong and could just sell crap to people, and people would buy it. Which is why the Japanese, after figuring out the market during the 70's then wiped the floor with them in the 80's and 90's.