There was a very strong pro 4E/anti 3.xE bias on ENWorld some months back and I felt the moderation was also biased. It got so bad, I was essentially driven away from the site coming back only occassionally and not posting anything. Moderation improved dramatically pretty fast though and pretty quickly ceased being biased at all (at least in my eyes). The site was still hostile to 3E/3.5E due to some vocal posters, but this tendency tended to diminish over time and things are much, much better now - hence I visit the site more often again, though not as much as prior to the edition schism.
(Note: I did not vote on the poll, because it is closed.)