A friend of mine recorded himself playing one of my games and I learned so much, things unspoken even. I could see his interaction, how he was feeling, the moment he got bored. And he would never have said those things because he is a wonderful and kind friend. :D So I think having video is something that can really bring the sense of what it means to a player, you can see unsaid things, pick up on their behavior in a way a text comment is never going to say either from time or simply kindness. :D cheers.