Mine was similar, but about 45 minutes.
It was open file and they didn't ask any ridiculous questions or make it into an inquisition. To be honest, I don't see the point of those questions. Either someone has appropriate social skills, a personality, makes eye contact, and seems genuine or they don't. If you can't tell from someone's application and a 30 minute interview if someone is a good fit, you're not going to figure it out in an hour or 2. Certainly not by asking them what kind of tree they would be.
I get why some schools like MMI as it in theory puts all candidates on equal footing, but that's not true anyway. Not every candidate starts on the same step and most applicants have studied all the ethics for MMI and have taken Casper.