I think this is an excellent idea. I've been visiting a few critiquing groups this past month to learn to be more detailed in my comments. I think it helps me not only to have my shots critiqued but critiquing others trains me to see what components/angles/settings make a good shot and I can become better with my own photography. So if some criteria is to be set up it might be beneficial to include participating in critiquing others photos when you've had yours critiqued. ;o)

Just my 2 cents
        

Treat people as if they were what they ought to be...
And you help them to become what they are capable of being.
                                                                ~Goethe~
R.I.G.H.T.S.