I think it's fairly hard to argue against the US having the broadest and deepest medical system in the world (for physicians, if not necessarily for patients w/o insurance).
However, the lack of consistency in academia must sometimes be seen as somewhat amusing. Ever wondered why a M.D., D.O., and even a D.P.M. are invariably by themselves and others referred to as "doctor", while a lawyer would be laughed out of any room if (s)he called her/himself "doctor". Why, really? Their degree is called a JD - Juris Doctor, and while a year shorter, is also a professional post-bac degree.
As an aside: In certain European countries, notably Germany and Switzerland, it's still not customary to call yourself "Dr." unless you've made a dr. med. dissertation (which arguably isn't the hardest degree to get). But if you don't have it, you're plain old "Mr." or "Ms.".