I agree there are some weaknesses, such as the top microswitches and the locking pump...
...but overall, these have turned out to be fairly reliable cars. Probably more reliable than the models released between 2001-05. This is partly because there isn't a mass of whiz-bang electronic modules just waiting to go bad.
If you can get a VMI on the car from an MB dealer, and it turns out clean, there's really no compelling reason to keep her from getting the car.