If you are a web designer and you haven't worked with Drupal before, you should really give it a try. Here are the top 5 reasons why:
In most CMSs you are dependent on WYSIWYG editors for large chunks of your markup. This means as soon as you turn it over to your client, you can kiss your layout good-bye. However in Drupal, you can carve out that markup and place it in your template, while still allowing you customer to update the content.
Drupal has a prolific and generous community. As a result there are more modules (read: features) available for Drupal than for any other CMS out there. This means more functionality that is readily available for the web savvy designer in the know, without needing to contract with developer to build.
The Wordpress template market is saturated, and the Drupal market isn't. This means less competition from a low-cost commoditized market.
You may be quick to point this out as a failing of Drupal when compared to a platform like Wordpress. On the contrary, for an intrepid web designer this actually means increased barriers to entry by their competition and more legitimately billable time.
Finally - and most importantly - the demand for Drupal websites is huge and is continuing to grow. This presents a market that provides a great long term opportunity for web designers,