The key to learn anything from this particular subforum is to read between the lines. First figure out who are the major players and earners to learn from them. ;p. If you stick around long enough you would know.
One hint is to see "who" are invited in those "special" google clubs. Adsense pub panel for one, if they say that they are in it, their posts are what you should really read and take to heart. And who goes to those adsense local meetings? You should listen to those people too.
Here's a short list of people that I do pay attention:
breeks, netmeg, Mentat, ember, jpch, puckparches. Or you can get more handful of names off [webmasterworld.com
Honestly I only pay attention to people who indirectly prove that they make good money and take this business seriously.
Everyone else is just noise. From a statistical kind of view, if a person is only earning $10 a day and say their stats is stuck and earning went to hell, I take that lightly. But if a $500-$1000 / day earner says that his earning went to 0, then my ear's all up. It's like cry wolf too, if a particular poster only says that his earning goes to hell day after day, I mentally mute the person and take all of his posts lightly.
If the big players are starting to get "anti-google", then you know something is definitely up. So do pay attention and you'll see what I see. The consensus of the forum as a whole is still "pro google", with a selected few that got hit by the various organic ranking updates. Google adsense is stronger than ever, once you take out the noises.
I do notice about the subforum though, is that "spicy" "google is evil" complains get replied to and bumped, and serious and practical knowledge and comments about how to make more money get ignored and buried. This phenomenon baffles me. Aren't we here to make more money? I am. So why don't people talk about how to make more? May it be technical, may it be placement analysis, may it be how adsense fares against other networks. More money is good.
Maybe that is why most serious posters and money makers have chosen to be silent.