Key car quality study ranks software bugs as most common complaint, knocks Ford again | Motoramic - Yahoo! Autos I'm a little surprised by that list. I thought Mercedes were the best built. I thought KIA would be way down on the list, but they one upped Lincoln. And I've LOVED every subaru I have ever had, so I'm shocked at the low ranking. and The smart car is ranked higher than I thought. It's tied for last instead of dead last.