Not to be a stickler for detail, but there is a little street opening up the interior of that Brattle block to circulation. See where the white truck is?
In any case, I agree with ablarc that his examples don't really implicate the problems of the superblock in the traditional sense. The passageways and alleys of these developments still approximate streets, compared to the free-form spaces of, say, Government Center or Charles River Park. Many 19th century European neighborhoods (in, say, Barcelona or Berlin) are composed of huge blocks. The streets are lined with 4-5 story apartment buildings, but their interiors are usually massive, park-like courtyards or even (in working class areas) auto-body shops or factories!
Doesn't this assumption, insofar as it lurks behind such developments, imply a sort of insidious essentializing of culture every bit as bad/wrong as the utopianism of Le Corbusier?
Another issue with living in a historic(ized) development: all the auretic charm of real history is evacuated. Streets curved and dipped in old neighborhoods for a reason. Walls and gates were built for a reason. There's nothing necessarily wrong with art for art's sake, but it seems particularly odd that today's art should be a facsimile of yesterday's necessities, other than to provide a comforting but obviously false illusion. I guess that's why these places seem designed to appeal to the Thomas Kinkade crowd. I mean, for god sakes, do even the signs even have to be neotraditional, too?