This is true, but it doesn't necessarily mean that I'm incorrect in my assessment. Compare the average Metafilter comment to the average YouTube comment. You'd have a difficult time making the case that there wasn't a discernible difference in quality between the two.
>>jacque+T
Aren't you engaging in the genetic fallacy here though? Pointing out a possible origin of my belief does not mean that you have disproved the belief.
>>daniel+f1
As developed through this discussion, my point would be that we need an outsider's perspective on the quality of a community. Perhaps a "passer by".