Wordpress Deutschland is asking for five good reasons to use Wordpress. It isn't hard for me to answer this question:
- It generates valid XHTML. Not every Blog or CMS system is able to do so.
- Own themes can be created easily and the time needed to get into the theme creation is much shorter than by other systems.
- No overloaded standard installation. The needed functions can be integrated with many plugins. Even own plugins can be developed and integrated easily.
- The interface is easy to use. After the installation of other systems I often did not now what to do when I logged into the admin menu.
- Last, but not least, it is for free and open source.