I disagree. I've been following those guidelines for a while, have a number of content-heavy information sites.
This isn't a whinge: most of my pages escaped Austin unscathed. However a few, seemingly randomly, have just disappeared and the new SERPS show less than useful pages instead.
How many others might disappear next time?
Why go to the effort building quality pages when Google seems to randomly dump on some?
I don't know what the key to the new Google algorithm is but it certainly isn't quality of content.