I would like to add that I found myself wishing that there was something like an MSAR specific to MD/PhD admissions. Especially when I applied to public schools, I felt it was hard to judge if a school would be a good fit numbers-wise or not because I didn't have a way of knowing if their MD/PhD stats would line up with in-state applicants, out of state, or neither. Using the AAMC facts tables definitely helped to know if I could be competitive at all, and a handful of schools do list stats for applicants interviewed/accepted etc on their websites (or at least the minimum requirements for the program, which didn't always align with MSAR). Maybe I was the only one, but it was difficult for me to identify where I realistically had chances, especially as a low GPA/ high MCAT applicant.
I ended up doing a fair amount of guessing and made my school list based on a broad "mid-tier" estimate combined with research interests and a light sprinkling of schools that I knew for sure would be a reach or where I had regional ties. Things obviously worked out in the end (I had mostly interviews at "safety schools", plus my state school and one super reach school), but I still feel that it would be extremely helpful for schools to let you know what type of applicants usually end up interviewing there and actually going there. If you had asked me where I thought I would interview when I submitted my application, the only school I would have gotten right would have been my state school, where I was working at the time and knew the program leadership. There is a lot more to admissions than GPA and MCAT, and there is inevitably a lot of unpredictability to the process, but if I had to apply again I would definitely want to have a better/more efficient way to gauge whether I would be competitive at a given school or not.
3 possible solutions I can think of:
1) schools simply list that information on their websites
2) MSAR adds an MD/PhD tab with information
3) AAMC makes another fact table that shows median + SD for GPA + MCAT for MD/PhD programs
Other than that, I think people have already addressed most of my major concerns here. I can't imagine that it's easy for adcoms to have to sift through hundreds of applications from qualified applicants and to have to find ways to stratify them. Even just from what I've seen here and conversations I've had with the faculty at the school where I matriculated, I think it has to be really tough to juggle the whole application cycle and deal with hordes of stressed pre-meds in addition to the rest of your usual responsibilities that don't magically disappear during the admissions cycle. Thanks to everyone who takes the time to help out with admissions advice here or in other places– I never would have gotten an acceptance anywhere without a lot of help along the way. Hopefully I can find a way to pay it forward down the road.
I will throw a shout out to one school that interviewed me in October, told me I would find out at the end of January, and then didn't actually tell me anything until I followed up for a second or third time in late March!