I like Cadillac's "Art and Science" design language (Ed had a hand in it, before he was Design Chief). The bold lines and angles are/were like nothing else and are what saved the brand.
https://www.fastcodesign.com/1672830/how-cadillac-designed-a...
https://www.fastcodesign.com/1672830/how-cadillac-designed-a...
The interiors are monuments to claustrophobic design and wasted space. I'm not tall and my head almost touches the ceiling of their latest models.
http://gmauthority.com/blog/2016/04/cadillac-contributed-rou...