I like constructive criticism, as long as it actually serves a purpose. Sometimes people really don't listen to what the artist is trying to do. For instance, if I was creating a cartoon figure, and the nose was extremely exaggerated, I don't need information about the nose being exactly placed in such and such place. There are liberties that can be taken, and people should consider that as well. Not everything has to follow an exact, cookie cut look, and from a lot of critique's and comments I've seen here and other places, that's what most people critique on. If it's not ultra-realism, it's not right. But of course, if someone is going for realism, then that's a different story.

Just an observation.