Good points Leon and I have thought the same a few times. Hell I have even just said "nice image" just for the sake of saying its a good photo. It would be nice to hear pointers from others. Personally I have no problem with people letting me know my images are crap or not and value the help from others that are more experienced. Some people do get offended by someone telling them what to do with their images, might be the way some come across over the net
Another way I have seen on other forums is a separate area just for this sort of thing, so if you want people to criticize your image you put it in that area, if you just want people to say great image, you put it in the general Deep Sky Astrophotography area? Just an idea.