I really can't make any coherent statement from everyone's opinions but I can say when I respond.
1) If a person clearly has not looked at the galleries to see how other people's work had been evaluated, just goes blindly ahead and posts 10 or 12 unnumbered random shots, I think, 'what a rude jerk' but I don't write anything.
2) If a person clearly has not looked at the galleries to see how other people's work had been evaluated and just blindly posts really bad images, badly exposed, badly composed and doesn't say anything about having a problem, I think, 'what a rude self-centered putz who thinks the art of photography started when he decided to post a picture' but I don't write anything.
3) If however, a person posts a picture or two and says something to the effect that they know this isn't right but they can't understand why, I'll do anything to help wherever I can.
The long term problem with situations 1 & 2 is that, inevitably someone, often someone who doesn't seem to know much more than the poster, will chime in and say something like I like 1 but cut off a bit at the bottom, I like 2 but it is too dark and so.
Telling people how you would correct an individual image is absolutely not the way to help someone, particularly someone who needs systemic help.
Corrections should only be made in response to recognition of a problem and, if the problem is sytemic to this person's work, then talk about the problem not the correction needed.