Are they really going to the MMI (or MMPI) interview format? I interviewed at VMRCVM which utilizes MMPI, and I felt like they had no idea who I was as an applicant afterwards. I was accepted, but could not tell you why for the life of me. I can't specifically address the questions they asked because I signed a confidentiality agreement, but some of them were so random (nothing to do with vetmed). The principle behind the method is that the questions are supposed to address ideal qualities in a veterinarian, like compassion and problem solving, but you don't know what each question assesses as they ask you. I felt like interpreting a Rorshach inkblot would have been more effective.
That's my opinion anyway, and a lot of people disagree with me. A lot of people really enjoyed the process, but I felt like they didn't know who I was at all at the end of it.