Your dealer experience with MB seems to be the same as everybody else. I can't remember the last time I heard / read somebody had a good experience at the dealer.
FWIW, everyone I've talked to who owns a Lexus has had zilch to few problems, loved their cars, and waxed poetic about their dealership experience. There are those that have complained about high parts cost, but it doesn't seem to bother them.
MB really needs to get their act together.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".