But if you do maintain them in that certain way, they can be brilliantly reliable. Problem is, many people (especially in America) don't. And getting the proper fluids for them can be a pain in the ass in America, since BMW LL oil is basically impossible to get anywhere except dealerships and specialty websites.
I'm surprised Mercedes is so low in the list. They've traditionally been one of the more reliable German brands, that's why they're used as taxis in many countries.