Surely, I've used the loop system quite often in designs, it is a good idea to provide recereational space within the cul-de-sac. In mexico, we normally call this system "cul-de-sac with common provate areas", unavailable to the regular pedestrian, but only to the cul-de-sac's residents.
Most of the time, however, and due to economical and space reasons, any regular loop in Mexico's new middle-class developments consists anywhere from 10 to 40 homes.
The idea on this loop is that the street you see at the bottom of thr picture is a public road, i.e. a series of smallish loops within a proper grid. I think ocne you start lookign at loops of tens of houses, you are getting into the usual problems of dead-end roads and collectors.