From someone that went through VMRCVM's MMI this past cycle, I just wanted to say that I actually much preferred the MMI format as opposed to the traditional interview format -- and I was absolutely TERRIFIED for that interview also, I had noooo idea what to expect! But I actually had a really great experience! There's several interviewers, so if you don't make a connection with one it is okay because there are others you might have a much better time with, and since each is a completely different scenario there are many more opportunities to REALLY showcase a lot of different qualities about yourself rather than a interview with one person where you may not get to touch on things about yourself that you really wish has been brought up in some way.
So for all you future C/O 2017'ers, don't be discouraged!!!! It sounds REALLY scary and daunting but I promise it is SO much better than it seems; believe it or not, but I even thought the MMI format was well, FUN! Don't let it keep you from applying at all!!!!