Agree, the website is the weak link of the WP Project. But I think they are very aware of that fact. Even Donnocha saw the importance of having a good documentation and started that for his WP Super Cache Plugin.

Of course this takes a lot of time and probably volunteer work of knowledgeable people but it should be done rather sooner than later. On the other hand, we have today so many excellent website with great WP content, WP Tavern or Dig WP, are just two of them where you can get almost everything you need to know (and the content being up to date).