It's a Drupal site... it's good if you actually know Drupal

I'm working on a Drupal 7 project right now where the site was built by another company. This isn't the first time I've “inherited” a project, and I'm sure it won't be the last. Before this project, my other experiences with taking over existing Drupal sites weren't terrible. Yeah, there were issues with the sites and things could have been better architected but, on the whole, I could jump in and figure out how things were glued together and fix issues or make improvements as needed without too much head-scratching.