Anecdotal obviously, but at Ohio State you sit down at 4 different tables a few minutes at a time, 2 with students and 2 with Professors. I felt like my interaction at the first student table was really weird and awkward and definitely felt like the student interviewer was the source, they made it difficult to carry on a normal conversation and just weren't easy to interact with, unlike the vast majority of pretty much everyone else on the interview circuit. (I fully admit that I performed poorly in a couple of my other interviews and they felt completely different from this one.) I thought that things went really well with the other student table and with the professors, but wasn't accepted. I still suspect that the first one had some negative notes which tanked me. Take it with a grain of salt, but if they're allowing students to be a part of the actual interview, they're definitely going to take their impressions into account.
