You should have created some anonymous form that they could submit to. I know you said you wouldn't be offended, but most people would not be brutally honest if you know they are the ones saying it.
As you can see, I beleived they would be. It turns out, more have come in and you are correct, many people have ignored the "do not qualify answers or list positive qualities" thing. That being said, the answers are helpful and while they are still somewhat tactful, they do have the criticism.