I am a 2017 WA school leaver so I did the curtin MMI in December 2017. I received an offer from UWA which was my first preference [ETA: and was advised I would have received an offer from Curtin had it been my first preference but of course there are so many variables in the final ranking] so I don't have a clue how successful I was at the Curtin interview.
I probably shouldn't say too much, and my memory is a little hazy, but I'll corroborate what MedicHP said about there being no puzzles or intelligence/logic questions, nor was there questions about the university and why you want to study there, all the stations assess your personal qualities and values just like most other medical schools.
As for the interview, you get 2 minutes to read and make notes about a prompt on the door (a situation or moral issue, a few times it was something more general) and then you go into the room, where you have to give your thoughts and then are asked follow up questions. Quite a bit of ethics (as opposed to UWA which had none and did not give you any specific scenarios).
FWIW, most people I talked to found it significantly more challenging than the UWA interview. The questions were harder at Curtin, and also the interviews were conducted by the professors and organisation on the day is run by the faculty staff, while at UWA the interviewers were people who seemed like volunteers (as the average age would have been well past retirement) and the organisation was done by students who joked around a bit and really helped to calm your nerves.