This site is excellent for learning to compose images and present them. Yes you will receive some trite reviews, and some seem to ego trip on their points, going for volume rather than quality in their critiques. Nevertheless overall I have learned a lot and I thought I knew it all. Sadly its popularity has fallen away and the original intention to be a broader site based on the bulletin boards has failed.
If you're happy to be limited to one image per three days, then the site is free. Highly recommended.