Many of the observations, and subsequent theories expressed in this thread are indeed, most insightful. I like enders assessment, in that a "non linear" structure is a much better approach when attempting to organize the creative process.
The Foundry structure seems to be created by a person that has a very mathematical, and analytical type mind. The problem as I see it, lies in the fact, that the Artistic Mind, and it's creative process does not thrive, and is not as productive when a rigged procedure is imposed on his or her creativity. The creative mind must be allowed to think, live, and breath, outside of the box. It is simply the nature of the Creative process. You can not make an "Assembly Line Artist", and then expect to get new and original maps. Artists are all different in the way they work. Some have a detailed game play worked out before they even start to think about the graphics. While others start with the graphics.
The compartmentalization has in a very short time, clearly shown what I have always believed to be true. And that is, most people are interested in the graphics and set up, and could not care less, about the aspects of game play, such as bonus amounts and neutral counts etc. (boring).
By setting things up in this rigged, non creative inducing manner, we have insured two things.
1.) The creative process will be somewhat smothered.
2.) Participation will fall off when a map is moved out of the melting pot.
I will say what has been said to me as a mapmaker- "Go back to the drawing board". It's just not working. ender has pointed the way. "non-linear" is the key thing, to keep in mind.
EDIT:
Just a quick idea off the top of my head.
Maybe it might work better if there was only two basic "Shops". One for Graphics and one for the nuts and bolts "Game Play".
Artists could submit drafts and once they are far enough along, and have the required support, then the "nuts and bolts pros can do their thing. The map can then be kicked back and forth as many times as it takes until both Shops are satisfied. Then it's Final Forge and Beta testing time.
It is simple and easy to understand. It also keeps people involved as a volley type atmosphere is achieved. A little more like a tennis match instead of a relay race, where after the baton is passed, the runner then takes a nap..