6: 1961 Oldsmobile Starfire
The Oldsmobile brand had many great performance cars over the brand’s lifespan, so what was the deal with the Starfire? The car just fell off when it came to performance and build quality. The interior was shoddy and there were a lot of reliability issues that consumers would complain about early on.
Likewise, the powerplant was not one of the best that GM has put into a vehicle. Oldsmobile was still in the development stages back then, and thus the Starfire was an unfinished product. These days you’ll seldom see a Starfire on the road as the cars are a rarity nowadays after all of the reliability issues.