17: Pontiac Grand Am
The Pontiac Grand Am had always been a sort of disguised performance sedan, but the mid-1990s version of the car was lackluster at best. The compact styling was more in line with a Chevy Cavalier than what you’d expect out of a Pontiac. The compact dimensions did nothing to bolster the appearance of the car and the sedan version was cramped (via Car Gurus).
There was a lot that the Grand Am did right, and a lot that it did wrong. From a quality perspective, the Grand Am started the less than stellar reputation that GM has today for build quality and reliability. GM has managed to come a long way in recent years but most of us just try to forget the Grand Am from this period.