You bring up a very interesting point. I have in the past commented on what seems like a perfect shot except for one minor detail. I think for the most part some folks are just afraid to post some too critical, especially once the WOW comments start flowing.

I once switched the setting to only ask for critical comments on one of my photos. Nothing really changed.

I've noticed that many of my favorite artists have stopped getting their photos rated. I wonder if this has anything to do with it?