6. Lincoln LS
Where do we start with this travesty? The Lincoln LS was a product of the Lincoln brand trying to be hip. The sedan was marketed as a modern and sophisticated sports sedan, but in reality, it was nothing more than a badge-engineered Jaguar. The problem with that was how bad the quality of Jaguar products was at the time. It rubbed off on the Lincoln as the LS was notorious for having quality issues. Where some big American luxury sedans were making progress, the Lincoln LS was taking a step back.
Sure, you got a roomy interior and powerful V8 engine but in reality, the LS was a blunder. These cars went on for a few years and were sold until the 2005 model year. There are a plethora of reliability issues on these cars and repairs were quite expensive. This was the main reason why the car never managed to sell very well.