The latest Joomla! does not have built in granular user access control,[1] although this is planned for Joomla! 1.6.[2]
The built in section/category feature is limited by the simple section/category/article hierarchy,[3] however flexible category structure support is planned for Joomla 1.6
Each website requires a separate Joomla! installation.[4]
Although Joomla! supports right-to-left languages, bi-directional templates are non-existent, other than those supplied with the Joomla! install. Third-party template developers universally work in hard-coded LTR or RTL, despite Joomla's comprehensive bi-directional support.[5]