12, One point about voting agreement vs. voting quality: frequently I read a post and think "Oh, the obvious [or ideally, nonobvious] objection to the author's point X is argument Y." I then click through to the comments with the intent of posting Y. If, however, someone has already made argument Y, then I will upvote that comment, because trivially I think it makes an important contribution to the discussion if I were planning on making it myself. But of course this also means that I agree with the comment (almost certainly: I haven't posted a argument I believe is wrong here yet, but I can well imagine doing so).

All that is to say that voting agreement and voting quality aren't as independent as some people seem to think.