13. Mercedes C230 Coupe
When the next-generation C-Class hit the market, shoppers were intrigued by the hatchback coupe variation. But the car quickly shot up the ranks for having expensive maintenance issues and subpar reliability. The cramped interior didn’t help things. The model lasted for quite some time but if you were to scour the internet for the one you wouldn’t see too many. Common issues on these involved the head gasket and valve cover gasket failures. The transmission was also quite finicky, and would often require multiple service intervals.
When it comes to choosing a Mercedes-Benz sports car, the C230 is one that should be at the bottom of your list. Design-wise, the car was an odd-shaped blend of German engineering and troubling reliability.