Like any car, it's not perfect. That said, I totally enjoy my 1998 E300,it has made me a Mercedes fan. You should use the search function on this forum for known issues (spring perches, window regulators, glow plugs, dashboard cracks, fuel lines probably covers most of it),using keywords w210, problems, should do it. I have only had mine 18 months and beleive time is best test, but so far it gives me everything I want/need in a car. It's a keeper.
Paul
98 E300