Considering that many (I would venture to say probably two-thirds) of these luxury rides are leased, and not actually owned outright, I think a more appropriate title might be : 'How luxury can be a better LEASE'.
In fact, if you really, really want unreliable German luxury, you are probably better off leasing and runing away before that Audi A4 starts giving you expensive headaches after 48 months (don't even get me started. I don't have enough space here). Lease a German and run away after 4 years maximum !
But if you want to buy luxury, get a Lexus, Infinity of Acura.