2: Cadillac Cimarron
The Cimarron is one of the worst Cadillac models ever made. For some reason, the car was based on the Chevy Cavalier compact car. The car didn’t enthuse consumers, which was obviously a bargain basement offering. Cadillac could have done better, but the Cimarron didn’t offer much luxury (via The Drive).
The Cimarron would go on with various revisions for almost a decade, but the car never managed to become a success for Cadillac. GM believed consumers would overlook the fact that the car was a rebadged Cavalier, but that never happened. The evidence that it was nothing more than a Cavalier was enough to ruin the reputation of the car.