Ed:
You're right. The comments of the critic many times speak more of the critic than the photograph. I learned this myself on a photo that I commented on and was promptly corrected by several other viewers. Not that I was wrong in my impression of the photo (I wasn't commenting on its techincal merits, that I recall), but that my view or impression of the photo was definitely out of synch with the rest of the community, here. I caused me, the critic, to re-evaluate my own perspective and to keep it in mind when wiewing others' works. On that occasion, at least from my perspective, the Critique forum was more valuable to me, the critic, than to the one posting the image.
With THAT said, I still believe that my comments were helpful to the photographer, in that he/she learned of the impact of the photo on me; as the comments of others did for them.
I really don't believe that most people make photographs for themselves. Most of us enjoy the process of photogrpahy, but the final image is made for the enjoyment of others. (Again, MY perspective..and I await the response of the rest of the community to affirm or contradict this...)
I think that a dialog takes place between the photographer and the viewer. The photographer creates an image that will provoke a desired (usually emotional) response from the viewer, and the viewer lets him/her know whether or not he achieved his goal. In the end, the viewer walks away saying, "I like it", "I love it" or "It sucks" and the photographer has something tucked away in his brain for the next frame...as does the viewer.