5. Saturn Sky
The Saturn Sky, introduced in 2006, was a stylish two-seater roadster that shared its platform with the Pontiac Solstice. (en.wikipedia.org) Despite its appealing design and performance, the Sky’s production was cut short due to the closure of the Saturn brand in 2009. (motorauthority.com) No significant refreshes or updates were ever released, and the model was discontinued without a true successor. (gmauthority.com)