I didn't vote on your Poll as it does not offer the choice that fits my behaviour.
I look and touch and if I feel enough for the image I will comment honestly and I think not too harshly. If however I do not feel competent enough to comment then I will not. Having said that in the past others have taken umbrage at what I have written regarding another's images but I believe that they have missed the point of CCing.
There are images on this site that do nothing for me and it is those images I quickly click out of. Two so far tonight.
I believe a part of the problem is that you have to look at the thread to view the image and it is only then that you will see the image and wether or not it is of interest to you.