MB's are like any other cars. Good ones and bad ones. My wife's 1998 E300D was terrible. She ditched it before the warranty ran out to make sure it didn't drive us into poverty. She also got tired of trips to the dealer. Her Subie has been deadly reliable so far.
OTOH, our C230 has been reliable to a fault.
Good luck in the future...
1998 C230 "Black Betty"