The value of a Hogwarts education NOV 10 2010
Here's an interesting theory from Sam Arbesman: the wizards from the Harry Potter books aren't that bright because their education neglects the basics.
As near as I can tell, if you grow up in the magical world (as opposed to be Muggle-born, for example), you do not go to school at all until the age of eleven. In fact, it's entirely unclear to me how the children of the wizarding world learn to read and write. There is a reason Hermione seems much more intelligent than Ron Weasley. It's because Ron is very likely completely uneducated.
My take is that wizards are jocks, not nerds; Hogwarts is not so much a secondary school as a sports academy. What's odd about that is that quidditch is an extracurricular...