Here's the reason I ask:
Don't jump all over me for saying this, but I honestly study 10x more than the students at my school who have gotten invitations to hopkins, mayo, etc. Tonight, they are out partying. I just got back from the library. They don't seem like they have as much motivation (maybe because it comes so easy to them). All I can is that I wish I was them. But, no. I study 12+ hours a day and get a 25 on the MCAT. I just suck at academic material that isn't medically related.
But, when I interned at a hospital this summer, I went home every day and looked up the things I heard the doctors say but didn't understand. By the end of the summer, I was participating with the medical students (answering the same questions they were). Several doctors about died laughing because I was constantly mistaken for a medical student. In fact, I actually changed the care that one patient received because I recognized when the PA was wrong.
So, I don't think that a 25 on the MCAT says that I won't be a good doctor. I think the fact that I was determined enough to study 10x as much as my peers for it and make many sacrifices along the way shows how hard I'll work for my patients. And, the fact that I looked up everything at the hospital when I didn't have to shows I'll be a good doctor. Because when I'm actually put in charge of someone's care, if I don't know the answer I'll find it.
Therefore, I agree that the medical school you go doesn't completely determine the kind of doctor you are going to be. Some people mentioned that your MCAT score shows your willingness to work hard. Not in my case.
(Getting off my soapbox now) Sorry, I'm just ranting in frustration because I've gotten about 10 rejections out of about 13 MD schools. But, at least I'm going somewhere.