10. Opel Kadett
Opel Kadett was one of the best-selling European compact economy cars. It was cheap, decently equipped, durable, and easy to maintain. For years, it enjoyed enormous popularity and was exported worldwide. (via AutoWeek).
Since the Opel was part of GM during the ’60s, General Motors decided to import Kadetts to America and sold them through the Buick dealership network. At first, Kadetts sold well but demand was soon gone. American buyers soon turned to Japanese compacts.