I wish I saw more consensus - things that are agreed upon by multiple sides - but in practice I tend to see a tyranny of the majority - whoever can win the upvote vs. downvote contest. The winning side rises to the top, while dissenting voices are silenced.
One sensible thing that I thought HN did but I don't see immediately in the guidelines is to suggest that downvoting isn't supposed to be a "dislike" button but is intended for comments that are spam, trolling, etc..
On HN, the first post to gather a lot of replies also seems to rise to the top.