Another problem is that already fixed error keep creeping in again. For we've got again a rather questionable map of the Persian empire. Also some authors seem to augment/combine already shaky or not particularly reliable sources which produces an even more questionable outcome. 
 The constant stream of (sometimes questionable) edits make any real quality management really difficult and verarious authors have simply giving up in the past. 
 There have been various AfDs in the past iirc, but they all failed.