Reading the oft-cited anarchist response might provide some context (though it was written in 2005): http://libcom.org/library/tyranny-of-tyranny-cathy-levine
Nearly every time the Tyranny of Structurelessness is posted to some activist's facebook wall these days, a link to the Tyranny of Tyranny is in the first few comments. Then the discussion devolves into rehashed bickering, though never about the actual content of the pieces.