Premeds are lemmings. Don't fall for the hype. Schools give out those lists because there will always be a nice range of matches for premeds to get excited about, notwithstanding that it is fairly impossible to assess whether it is a "good" list, based on the reasons others indicated above. It, at best, just shows folks that someone from this school was able to get into, say, derm. I would look at these lists as interesting, but not particularly useful. The coolness of the school T-shirts in the book store are a far more helpful way to select a school IMHO.🙂
That's just plain old silly to scoff at folks for going into internal medicine because the vast majority of folks I know doing IM are doing it as a gateway to heme/onc, pulm/critical care, cardiology, etc. At any rate, even if all of these same people were going into interal medicine to do outpatient primary care for the rest of their lives, more power to them. We need more good internists.
You really cannot interpret match lists. The only thing I could see them being useful for is that generally, some schools will turn out more primary care folks (although like I said, you cannot even assume folks going into peds and IM are going to do primary care) while others will have the majority of people into more specialized fields like ortho, derm, gen surg, urology, EM, etc. To some extent, I believe the school plays a role in this, but keep in mind, people drawn to primary care will go to schools known for primary care in the first place (like ECU, U Washington, Mercer, etc).
Probably the majority of my class is staying the southeast for residency. Is this because they couldn't get into programs elsewhere? Definitely not--we're sending folks to Mass Gen, Brigham (both Harvard affiliated), Yale UCSF, U. of Washington, UCI, Brown, Hawaii, etc. It's just that my school is in the southeast and lots of people have family in the southeast and don't want to be a day's plane ride away from them for a variety of reasons. We've also come to appreciate warm weather and don't want to trudge to work through feet of snow on a regular basis.
Bottom line--it's really not possible for you to interpret because you don't know why people pick certain geographic locations and you don't know why people are going into certain fields. Plus as a premed, you definitely don't even know what qualifies as a good residency program. (Here's a hint--it ain't all US News and World report rankings.) I don't know why med schools really even bother showing the lists on interview days.