16: 2002 Saab 9-5
The Saab 9-5 is one of the most controversial cars of the 2000s. The car hit the market at a time when GM purchased the Saab brand. What used to be excellent engineering and driving characteristics was anything but that. The 9-5 just didn’t live up to the hype and its reliability was downright horrible (via Forbes).
Even today, the car is often billed as an unreliable ride, and not one that you want to purchase used. The Saab brand went dramatically downhill in terms of quality after the GM purchase, and it never did recover. There were much better options if you wanted a Swedish ride, and the demise of Saab was a sad one.