There is indeed a lesson here, but which one do you think it is? It's certainly not that McDonald's makes better (or "simpler") hamburgers: once you taste good hamburgers you can never go back to McDonald's (and yes, I make better hamburgers too, even though mine won't win any prizes!). To me, the lesson is that there's more to success than product quality. The established brand matters, the scale at which you can sell a (possibly inferior) product matters, how low you can get away with paying your employees matters, how well you can survive PR disasters matters, etc.
If you had to make burgers, would you rather make cheap and mediocre ones, or would you rather enjoy making premium burgers? :)