[wulf]

Comment vs critique is a bit fuzzy. I think "comments" should be limited to things like "Great shot!" (and other encouragements - if you hate a picture, don't waste your time on it) and perhaps questions about the subject like "What breed of dog was that?" or "I know that spot - have you been there early in the morning when the sun is just rising".

In a nutshell, things you could say to someone who isn't necessarily a very technically skill photographer and who won't get stuff like "You should have used the rule of thirds" or "a smaller aperture would give you better DoF". That's not to say the more technically skilled photographers shouldn't post in Share Your Shots - sometimes they also want to share a shot they love without people obsessing about whether the horizon is completely level!

Wulf