Personally, I could care less one way or the other whether comments are issued on the fractal creations I make. I am usually just playing around, testing the limitations and abilities of a specific application. Occasionally I render something I feel is interesting, and then I save it for displaying later on. But most of these never see the light of day, so to speak.
That's kind of the way I see it. This is just an occasional hobby for me and I'm just happy if someone has taken the time to comment on my images, regardless of what they have to say. It's better to be spoken about than not spoken about, as Oscar Wilde once said.
As a user, rather than an originator of fractal software (as well as being my own worst critic), I often see myself as being merely a Discoverer of fractal patterns. Sometimes I feel the beauty I see in them is a personal thing; other times I think it's something that will appeal to others. In the latter situation I find I usually have to do some "work", in order to isolate and bring out the key attraction I see in a fractal; through framing, composition, lighting, colouring, etc. - but I'm still not sure at what point it becomes "Art".
I commented in the Making It Personal thread, that I believe negative opinion can ultimately be a constructive thing; but it's important to frame it in the correct terms. One way is to cushion it by mentioning any positives first. Another technique can be to frame it as a question,
e.g. "I wonder what would happen, if you changed the colour scheme to something a bit more neutral?"
£0.02