I don't really see tl;dr comments very often, but when there are links to other submissions of the same item I don't mind so much as there is other discussion t

I don't really see tl;dr comments very often, but when there are links to other submissions of the same item I don't mind so much as there is other discussion to browse through. Comments already can be flagged so I don't know why a joke flag would be needed, and jokes are pretty rarely voted up unless the articles is more of a joke article. I think comments are easy enough to skim that most of these complaints really don't matter, besides community wiki type thing wouldn't be of much use as hacker news comment threads tend to die off quite quickly.