Moore, you are right that choosing MCD as a comparison is a case of hindsight investing. But so is choosing today's gold price as representative of the value of gold. Gold *might* be in an almighty bubble. The 1999 price *might* be equally representative, and at that point even Kodak had performed better, at least from 1974 which is the furthest back that I have data. (I don't believe 1999 is representative, but you get the point.)
My view is that whether it should or not, gold will likely maintain its purchasing power over long periods of time. That's not a bad result. But great businesses, few and far between though they are, have a record of increasing their purchasing power over time. Surely that's a better result?
More controversially I'd also argue that disciplined investors can add to the return on stocks by buying below intrinsic value, whereas intrinsic value is hard to calculate for gold and buy/sell decisions have largely to be based on macro analysis, and we all know how hard that is.
For me it is a total no-brainer, especially after the run gold has had. But then my father used to say that the term 'no-brainer', logically, ought to refer a decision taken by a person with no brain. Time will tell! ;)