The success of an open-source project such as Drupal largely depends on the quality (and efficiency) of the support that community members offer to each other. Although Drupal offers support through various channels, the Support Forum on drupal.org probably is the most important 'gateway to help' for most users.
My personal feeling has always been that, generally speaking, the support on the forums is fast, efficient, and almost always leads to some kind of solution for the problem being discussed. However, after following this thread, I started wondering exactly how well we are doing in the support forums, obviously staying neutral concerning the actual discussion in that specific thread. One way to express that, would be to calculate the forums' response ratio, being the percentage of topics to which at least one reply was posted. This of course doesn't account for the responses' quality, but it gives an idea of the forum activity.