On a scale of one to ten, rate me as an interviewer.

Well, I don't think anyone can be a good judge of anything in such a short time span. I believe it would be naive of me to think that I can rate you out of ten at your own job by only spending 30 minutes with you. However, I can rate this interview session a perfect 10 on 10 as it met all my expectations and I had a great experience interacting with you gentlemen/the panel.