A meaningful article that does not actually bash WordPress. Jeff Eaton’s comment there rings true to me:
WordPress is excellent because it is focused. The farther it moves away from its laser focus into the realm of general purpose CMS, the more it faces the problems that tools like Joomla! and Drupal do. And unfortunately, that’s when its tailored, streamlined admin UI becomes an anchor around its neck.
Various WordPress plugins for CMS needs (e.g galleries, custom post types), almost always have admin interfaces that’s different and inconsistent with each other, potentially making it harder for end users to learn them all.
Maybe it’s time for a WordPress Human Interface Guidelines, a la Apple?