Jason:
Not dissing MM.Net here, I haven't looked at it in awhile. But sign up for the Strataframe online demo, and take a look at their approach, I think you will be impressed. My only reservations about it at this point is that its still in its infancy, it has a small user base, and its priced above its competitors (especially when you add the database deployment product).
However I've been thinking about that mysterious element that makes a frameworks attractive to me. I keep going back to a statement by Daniel Ingalls one of the writers of Smalltalk:

Personal Mastery: If a system is to serve the creative spirit, it must be entirely comprehensible to a single individual.

When I looked at Strataframe it was 'comprehensible', a truly subjective non-scientific analysis, whereas MM.Net seemed still obscure (at the point that I was looking at it). I got that same feeling from Codemine.

Mike