I was accepted to the MA in Medical Sciences program at BU Medical but my pre-med advisor told me not to enter it. Students with sub-par GPAs and MCATs/GREs typically enter the program. If you are a borderline applicant (3.1-3.4 GPA range; 23-28 MCAT), you're better off taking additional science courses in a post-baccalaureate program and re-taking the MCAT. The MA in Medical Sciences program at BU Medical will put you in courses with other medical students and MA students, and you will be evaluated on a GRADED basis (MA students are evaluated separately from medical students). Yes, there is a curve, but many of the students (I have three friends in the program) are "gunners" who study like mad because this is their last shot at getting into medical school. This creates a highly competitive atmosphere.
The program also requires you to complete a thesis, which extends the duration of the program. In fact, when I spoke to Dr. Broitman, one of the directors of the program, he said that MA students spent one year taking courses, and another year working on their theses and preparing for the MCAT. So you're in for two years, at approximately $35,000/year tuition + cost of living in Boston which is NOT CHEAP!
As far as students getting in, the school has a pretty good acceptance rate which hangs around 90% -- students get into allopathic and osteopathic medical schools. Others students pursue dentistry, PhDs, etc. As for students getting into BU Medical, I remember hearing that the top 20-30% of the MA students actually get accepted there. The rest usually get in somewhere else, as described above.
In sum, I would not recommend the program unless you've tried every other option -- applying to MD and DO programs and not succeeding, doing a post-bacc program and not doing very well, repeatedly bombing the MCAT, etc. When asked about his thoughts on MA programs in Medical Sciences, my pre-med advisor, who has been advising pre-meds for over 40 years, replied "they're brutal and expensive."
Here's a link for more info:
http://155.41.250.49/Catalog/medsci/intro.htm