I'd be interested in reading more about that if you have a link. Reddit says to "moderate based on quality, not opinion" whereas PG said explicitly to do the opposite. (I can't remember how to find the link atm, but it was a comment in some thread on HN that I've seen people refer to.)

http://www.reddit.com/wiki/reddiquette

I also found this discussion, which says that in practice there will always be a middle ground between moderating based on quality and moderating based on opinion:

http://www.reddit.com/r/TheoryOfReddit/comments/1g14yo/is_th...

because our ego bias is to moderate based on opinion. However that's why a guideline to moderate based on quality pulls things towards the middle.