It is hard to interpret because you know nothing about any of the data. What if a school matches a bunch of people to primary care? Does that mean the school sucks? Or does it mean that the students that year just happened to be interested in primary care? How do you know what a good residency is? How do you know that students decided not to forgo residency at a "prestigious" institution in favor of being close to family or getting to another part of the country?
The point is that this data is difficult to interpret even if you're outside a particular SPECIALTY, much less as a pre-med that hasn't even submitted his/her AMCAS.
Agreed. You can't know how to interpret a match list without talking with each individual student. I have a classmate that matched into a solid IM program, but wanted to do OB/gyn and only ended up 1 interview in the specialty. People might see that and be impressed when it wasn't what he wanted. Another one of my classmates is going into IM - she's freaking brilliant. She had everything it takes to be at a MGH, BWH, Mayo, NYP, WashU, etc for IM but wanted to move to the city where her husband had a connection to get a good job. She got her number 1, but you might see that and think she was disappointed because it's only an above average program, not elite.
I ended up matching at my favorite program. I interviewed at Harvard, UNC, Vandy and a few other big name places; turned down interviews at Hopkins, Stanford, etc. If you saw where I am going on my school's match list, you might say "Oh, that's a really strong program" but you wouldn't say "wow, he matched at Harvard/Yale/Whatever." Coincidentally, I had a classmate match at Yale for my specialty - pre-meds will probably be impressed by that, but in the specialty I matched into, it's just OK. Another friend matched into a top program in the field, but it's a stand-alone hospital that pre-meds wouldn't know about because it's not affiliated with a med school.
The point of all of this is simply to say that you can't know how to interpret match lists without literally getting an honest interview from every student in the class over a several year period.