I see an MBA differently from most people. I think that there is very little to learn in an MBA program that is as essential as humility. The MBA program provides opportunities for you to see that you are not the most qualified at any particular aspect of business. Leaving an MBA program, one should be saying, "If I run a company, I better make sure that all the work is done by my awesome classmates." This humility and self honesty helps a leader to compensate for their failings by hiring the best and brightest and simply overseeing them and directing their excellent work.
Thus, an MBA teaches us to rely on the brilliance of others to achieve great things instead of relying solely on our own abilities.