(Insert usual disclaimer that I'm not on adcomm) The interview is very important in the decision, though I can't comment on the validity of the ranking thing someone above said. Grades and MCAT can tell us if you can do sufficiently well in med school. Essays can tell us a bit about you, but everyone has a lot of room to edit how they appear in those essays. Its not until the interview that we really get an idea of who you are as a person, how you work with other people, and how you would fit in the environment we already have at UNC. I've said for a long time, that UNC doesn't necessarily select the best students (though their students do very well), but they do select the best people. We have a big emphasis on collaboration and teamwork, so we want people who are caring and can work well with others, and the hyper-competitive med school stereotype really doesn't exist here. These are things you just can't assess without meeting someone. I only know about evaluating the group interviews, but very few people stand out as red flags during that portion. Ultimately, we have a lot of people who could fit well here, but we can't take everyone, so they have to look for the people who stand out as great during the interview. I hope this helps!