ummm you must be confusing BMW with Mercedes
it's well known, that with BMWs that you get rid of it after the warranty..and that they are not as reliable as say Lexus...Drive well, but maintenance is high as a giraffe's ass. same with Mercedes...Both BMW and Mercedes were trying to outdo each other with tech...this reach a head with the E65 7 series and the W220 S Class, they were putting tech in there untested---it was the customers that were the guinea pigs...
Mercedes boss back in 2006, had said that starting with that yr's line up, Mercedes would be better quality.
As far as this vid, neither driver was good, because both these cars can run low, low 3s....