Jalonpik did a list of the 10 worst German cars built. The W202 and W203 made the list.

The Ten Worst German Cars Ever Made

The W201 generation Mercedes 190E was known for it's excellent reliability and over-engineered brilliance. It's successor the W202 C-Class was not known for either of those things, rather, it was known for dodgy electronics, and it's propensity to rust. The cheapening of Mercedes began here.