WordPress has a very intuitive interface that requires very little training to use. Anyone can become a WordPress expert within a few uses. Believe it or not, you can get WordPress up and running in 5 minutes! Don’t believe us? Take a look at WP Famous 5-Minute Install.
WordPress has a wealth of innate features to facilitate the creation of blogs and complete websites. search-engine-friendly urls, support for multiple templates, easy management of files, scheduling of posts, user management, built-in WYSIWYG editor, revision tracking
If you do have problems, or want to add very custom features, it is easy to find support and developers who can help you.
Large and loyal user community
Matt Cutts, the head of Google’s “web spam team” spoke at WordCamp SF 2009 and said “WordPress is a great choice” (video and slides here) he goes on to gush about how much WordPress helps you get better results. We always recommend a conversion to WordPress.