Well, I can only tell on my own experience but, if you didn't do consulting (especially Mckenzie), finance or IB, or been in the army (or a Mormon according to "ahead of the curve") your odds to get in are ridiculously low. Only if you have a killer essay that they really like. You also must be at the right age (25-28)
Wharton also want people from finance and high GMAT.
MIT are more technological, so if you're coming from a technology background, and espcially if you say you want to be an entrepreneur, you might hit its radar. They also like candidates with high GMAT.
For Stanford you must have a unique story. You must show aptitude and leadership both in your CV and in your essay and show that you want to make an impact and that you really thought about it.
Anyway, unless you have a real amazing story behind, your GMAT isn't serving you well.