Can you point us toward data that backs up your point that "the scalability story is more or less false"? Seems like FUD.

There are several well-documented, major production deployments of MongoDB already, that seem to contradict your assertion:

    * Etsy
    * CERN
    * BoxedIce (600MM+ documents)
    * BuzzFeed (400MM+ datapoints/month)

That's just a few from http://www.mongodb.org/display/DOCS/Production+Deployments