The quality of the euro and US cars is exactly the same. We do not have that many (standard) options, but all the used materials are the same.
The cheapest quality failures on the W202 C class were the manual adjusted cloth seats from 1993-1997, the FAN of the STANDARD heater system (NO-airco), the fuel injection pump of the C220D and the plastic (squeaking) clutch pedal. Since the US vehicles have the more expensive seats, airco systems, no diesels and auto transmission...you do not share that problem.
The C class is build to cheap...It is nothing compared to the older or more expensive models. "Just take a look at the rear door sills...these are just a joke (same for the E class)...
with a minor 600+k