Having worked "behind the scenes" in the trade (warranty repairs on car audio stuff) I can confirm that, from Aberdeen to Exeter, no other dealer network has quite the sh***y attitude you'll find under the 3 pointed star; it's really quite surprising that so many disparate dealers could be such a pain to deal with, but it seemed to be demonstrably true that MB dealers were to a one complete *&&%^% &%%$* and %^&s
"Dear Mr MB dealer,
A golf tee trapped in a CD changer is not a warranty fault, especially not after either the customer or yourself attempted to remove it with a crowbar and hacksaw. PS I'm not blind and gluing the case shut with windscreen sealant didn't help your chances."
^^^ Actually happened, dealer went to my boss to try and get me sacked for not just fixing it and billing Bosch.
My experience in that workshop has soured me on MB dealers for life.
Best dealers were unfailingly Skoda ones, I found, but then this was in the early VW days so maybe they were just relieved the skip jokes were dying out.