12. Oldsmobile Alero
Toward the end of its life cycle, the Oldsmobile brand was dated and made nothing more than rebadged cars. There was not one unique Oldsmobile car model except for the Aurora. The Oldsmobile Alero was a cheap coupe and sedan. The V6 engine was a solid power plant for the Alero, but that was the only option. The car never had any major upgrades during its run.
The Alero could have been a great compact car to get Oldsmobile back into the mainstream. But around this time, GM was focusing more energy and resources on full-size SUV models. Unfortunately, the Alero was just an afterthought in a crowded marketplace of like-minded automobiles.