Agreed on the above quote. Just to offer another opinion as to how BU selects candidates for offers of admission.
It seems to me that a lot more goes into the selection process than just numbers, although BU can tend to look like a number oriented institution. Offers of admission seem to be given to applicants who will not only work to exemplify the BUMC motto of "exceptional care without exception" but also be engaging, active members of the BUSM community.
I say the "BUSM community" because, after being here for some time, that is what it really is. Clinicians, researchers, faculty, staff, and students all have a vey close bond. As this is the case with most other schools, I think BUSM illustrates how much a close knit community means to them. Its been said before but they aren't just accepting a student, they are accepting a future colleague.
With that said, if you have interviewed here and are wondering where you stand? I think the best indicator would be how well you leveled with your interviewer. Did you laugh with them? Were they engaging you as actively as you tried to engage them? Was it a positive experience or just another formality to get that acceptance letter in the mail?
Even though why you want to go to medical school is important, at BU it may be just as important to be a candidate that would "fit" in here but will also embrace the community that is BUSM.