The number of unmatched seems a bit high, and is probably explainable, but I think it just generally shows how competitive stuff is getting as the number of students increases, matriculation averages increase, but the number of residency spots stays put.
HOWEVER ... please quit making assumptions based off match lists. Ask any med student, resident, etc, they will all tell you its asinine, and really only tells you what the class was interested in. For example, to the person who listed all the things that people didn't match in ... it's a very good chance that no one was interested in plastics, for example. Furthermore, remember that there are AOA fields that match PGY-2 from a TRI (there were a lot of TRIs on the list), and that people can also do fellowships in the future. In summation ... don't base stuff off match lists. They are fun, they let you check out a few rockstars, etc, but at the core ... they just aren't a good indicator of school quality.