half the fun of going to an interview is seeing the students in their groove and talking to them. i would think this would be drastically reduced during a saturday interview. seems like the only people you would see is in the library or in random groups around.
yesterday i was all dressed up in my tie and suit and i went to the bathroom away from my group and on the way there and back, about 10 people told me good luck and it really reinforced my desire for the school. this wouldn't happen on saturday.
that being said, my schedule would LOVE more saturday interviews.