Thanks so far...but i might have mislead some with my question. I really was not asking for advise on what car i should choose regarding my size, family size, etc. I can go look and test drive along with my wife (car will be hers) and we can decide on the make and model. My concern was problems with some models and which ones may not be best. I realize that this is Mercedes forum and some may not like what others say about certain models and do not want to be responsible for starting a thread to get people upset. However, we all know there certain flaws with all makes and just wanted to uncover a few before purchasing. Thanks again.
You need to narrow down what you are looking at. Simply coming on here and asking people to list every single problematic Mercedes made to date is completely unrealistic. It would take several hours.
You need to tell us that you have narrowed it down to a C or E class or a ML or GL, then ask us what models/years to avoid or get.