Drupal is uneven, missing features that you would expect from a full CMS and enabling functionality via contrib modules that I have spent months coding in the past. Features show up that are clearly not ready for prime time and are slowly developed into useful modules that become a core part of the Drupal developer's toolkit. It really seems like the archetypal open source/agile project in that way. Unfortunately, that style doesn't work well in a dead tree format. It will be interesting to see if a second edition hits the shelves that fixes some of the glaring problems.
What opensource CMS's are good?