Harlan,
My college has formal feedback surveys that use bubbles just as you say and I find them of no value, though the college uses them for faculty evaluations. The real feedback for me comes from my students when we complete a project, exam or special activity. I give them a 3X5 card and have them respond to several questions about the topic on which I want feedback. They do not put their names on the cards. In all of my years of teaching I have never received any nasty feedback. What I have received is feedback both positive and negative that has helped me to do a better job of teaching. I have the students fill out the cards 4 or 5 times during the course so the feedback is ongoing. What I don't like about the bubble surveys is that they are done at the end of the course when the students are focused on completing their projects and taking the final exam so they just fill in the bubbles so they can get out of the classroom and get on with their other work.
Gary
Gary Meers, Ed.D.