The site in general is good, but the user moderation system is utterly awful. A 'disagree' mod double-functions as a censor, and there's no need because there's also a separate flagging system. My profile page has a bit of a rant about the shortcomings of the mod system here with more detail.
The autodetection algorithms probably need tweaking as well - from time to time I see users with polite comment histories mysteriously getting shadowbanned. Sometimes another user will look into it and post a comment to that effect, but without a user-to-user messaging system or a method to reply to dead comments, there's no guarantee that a shadowbanned user will see a friendly message.
Not only does it censor, it gives some people undue power. A few days ago, I commented on a now flagkilled post. Within a couple of hours, some 15-20 other people had commented on it, and each and every post, except mine, was grayed out from downvotes. I had gotten a downvote too, but I had enough votes to counterbalance the briagading. I read the other comments, but did not notice anything nasty or disrespectful in there.
This abuse of power is ruining the system for those who have new accounts or only post occasionally.
The autodetection algorithms probably need tweaking as well - from time to time I see users with polite comment histories mysteriously getting shadowbanned. Sometimes another user will look into it and post a comment to that effect, but without a user-to-user messaging system or a method to reply to dead comments, there's no guarantee that a shadowbanned user will see a friendly message.