23: Chevrolet Corvair
The Corvair was a controversial car and the reason we have such strict safety regulations when it comes to vehicles today. This was the car that inspired Congress to mandate that all new vehicles had seatbelts. It was not that the Corvair was a bad car, but there were aspects of its design that made it unsafe. GM addressed these problems with recalls later on down the road, but it was far too late as its reputation had already been tarnished (via Gold Eagle).
They said the Corvair was unsafe at any speed and Ralph Nader even wrote a book about the car. Sadly, the Corvair was discontinued not that long after and the car has become a collector’s item. The design of the Corvair was attractive, if not the most unique design at the time. The proportions of the car were much smaller than anything else on the market. But with the faulty design from the jump, GM was marred in controversy over the Corvair.