Personally, I allow comments but not ratings.  I tried ratings and this got to be a "look forward to" issue..I felt it was not an honest way to judge an image aor accept judgment on one of my shots.  I pretty well know if my shot justifies some comments in the first place.  "Comments only" works for me since I can at least segregate the fluff from the honest praise and constructive criticism.

(Then again, the particular image may mean something special to the one making a more extremely nice comment than expected.)

I view many image in several forms of graphics and comment on the ones I feel stir me enough to do that.  Otherwise, no comment.   I do not comment to receive comments or offer the favor of a comment because I received one.  Sure, when a photographer is new and trying, I will comment to encourage and offer constructive advice.  I have yet been rebuffed for kindly stated constructive criticism coupled with encouragement.

Leave it as it is..we will take it as it comes and deal with each shot as we may.  Sure, I do wish some who allow no comments would in the least do that.