The best use cases for Drupal (versus WordPress) are for sites that require complex data organization and presentation and for community platform sites with multiple users.
The vast majority of our Drupal development is done on Intranet sites or for back-end administrative functionality. We've developed everything from online education, online testing, job applications, HR Management, real estate management, backend event registration/registrant management, internal graphic and document libraries, print to PDF monthly e-magazines, custom HTML eMail generators, project trackers, and much more.
Below is a small sample of our front facing Drupal development to prove you don't have to look like an automotive parts website to benefit from one of the best CMS's available. Dries Buytaert has pulled together a list of prominent Drupal Sites. If you are wondering if Drupal as a CMS is right for you, you should check out his site.