Like most have said, everyone there that I met was extremely nice (faculty, residents, medical students, and other applicants). They really want to see how you work and interact with others. As far as the interviews go, the doctors that interviewed me were extremely nice - and truly are trying to get to know you. Be ready to tell them about yourself - I took the approach of explaining who I am outside of medicine. Then they ask three "structured" questions. Be ready to explain "why medicine" and possibly a scenario-based situation. I don't think there is a right or wrong answer because we're not doctors yet, and from my understanding, they are trying to see how you think through a problem and consider the stakeholders, and pros/cons etc (at least that's the approach I've taken with traditional and mmi scenario based questions). Hope this helps, and good luck!!