i sort of disagree with this. i think, in part, your numbers ARE who you are. i honestly hope that the interview alone is never the deciding factor. anyone can put on a front for 30 minutes and not come close to who that real person is. they should not be admitted based on what they present before one person in an interview. likewise, it would be so unfortunate if someone were to be denied admission based solely on an interview in which they perhaps were nervous, didn't feel good, or who knows what. it HAS to be more than just the "feel" an interviewer gets about a person in less than an hour.
my personal thoughts are that the interview is definitely important... but not as the deciding factor... i think it is partly a chance to be sure the candidate is getting a firsthand view of the school, and partly a chance to clear up any questions or issues that may exist. it also might be used to confirm that the candidate is who he/she claims to be or even to send up a red flag in rare instances.
let's hope our doctors have been evaluated on wayyyyy more than a short and somewhat "staged" conversation.