I had one MMI interview at Marquette. I was very nervous but I got worked up for nothing. The beautiful thing about MMI is that you have the chance to redeem yourself if you don't connect with one of your interviewers. You also don't need to go too far in depth with any of your answers because you know a bell is going to go off shortly that will signal for your rotation to another mini interview. As long as you walk up to each interviewer with a smile, firm handshake, and can answer their one or two questions well, you can walk out with confidence.