I'm always reading comments/replies on others' work. I usually skim pointless "OMG SO AWESUM" comments, but I do read through the ones that give good criticism or actually say something constructive.
I don't think it's so bad to leave a simple, positive comment, but I definitely wish there were more comments that had thought put into them. I try to mention the things that I like about the image and (if applicable) things that I think could be done better to improve for the future.
Devious Comments
I usually skim pointless "OMG SO AWESUM" comments, but I do read through the ones that give good criticism or actually say something constructive.
1) Inane, mindless fangirl squeeing
2) Needlessly rude/cruel critiques.
But then, I also rarely comment myself. (; If I like something, I fav it instead of contributing one of these two crap comments...