In retrospect, I can definitely understand why *some* medical student interviewers might be tough on their interviewees. I like to think of them as more "borderline" interviewers, in the sense that they're more likely to be either overwhelmingly supportive of you or overwhelmingly disapproving of you. In any case, I think that it's the applicant's job to convey their strengths and attributes effectively to audiences of all types.
It's been said that PhDs are the "easiest" interviewers, due to their stereotype of being less confrontational, more open, and more easily impressed. Older MDs may be the same way - or possibly the complete opposite - depending on his or her personality.
I feel like the younger MDs and med students that have endured this process in an arguably more competitive environment than say, 15-20 years ago, might be jaded by it in a way that makes them hungry for the "gunners" - the "Cristina Yang" types that few would enjoy working with during residency (at least not initially). If you're like me and feel lucky enough to even get your foot in the door, then this sort of interview could go well. All in all, it seems that humility is especially key in a student interview.
So would I be a tough interviewer or an easy one? I'm a PhD, but I'm also a third year med student adcom.
All joking aside, the purpose of student interviews is to get the applicant to relax and open up so that we can find out more about you as a person. Usually student interviewers do not have access to your file, so they are only basing their judgment of you on how you interact during the interview. Even though I read the students' apps before voting at the adcom meeting, I don't read them before the interview. During the interview, I don't know what your MCAT score is or what ECs you've done or that you were caught drinking underage, unless you tell me. So I go into the interview as blind as any other student interviewer, with no preconceived notions.
You want some student interview advice? Here's mine:
1) One way to really not impress me is to have canned answers for everything. I'm not saying that doing a mock interview or two and thinking about why you want to go to med school are bad ideas. But I really hate generic answers that don't tell me anything about *you*. You have no idea what I want to hear, and I've participated in way more med school interviews than you have, so don't try to BS me.
2) It's also bad if I have to drag everything out of you; those are very painful interviews. If I ask you an open-ended question, don't give me a one word answer!
3) Read about my school before you come here. If I am talking to you about some aspect of the curriculum that I think might interest you, don't be clueless because you didn't bother to do your homework first.
4) It should go without saying that being arrogant, condescending, unprofessional, or rude to *anyone* you meet on interview day (including the admissions office staff) will not endear you to me. Not that I'll ever have to deal with you, but I have enough pity on the incoming first year class to not want to subject them to a future classmate who is a total tool.
5) Seriously, relax and let me get to know you a little. You don't have to call me Doctor Quimica; no one else does. You don't have to be so anxious that you can't focus on the conversation; I'm not going to leap up and bite you, or ask you to open a window that's been nailed shut. I really want to like you and be able to go to bat for you. But you have to help me and give me some convincing ammo to take to the rest of the adcom.
Best of luck to all of you who are applying, and stay cool.