Everyone knows that I am a Drupal fan - I build most of my sites and my client sites with Drupal. But, often people think that Drupal is more difficult than WP or Joomla. Thats really not true.

Check out this CMS Competition that was held for the 2009 SXSW festival:
http://www.cmsshowdown.com/competition

The overall results:
Drupal Joomla! WordPress
Total Hours 79.25 57.25 90.5
Hours spent on
front end...