Slashdot devolved into irrelevant memes by their moderation point system. Every Subreddit eventually becomes an echo chamber. Only on hacker news can you find very divergent opinions expressed side by side without banning, censoring, downvoting or trolling. I'm not saying that pending comments will destroy that, but I already while writing this comment I'm worried about being liked by the big guys. New people with valid opinions who might not know how to appeal to the site's group-think will have a bad time. People with poor language skills will have a bad time. And of course, jokes will have a bad time, and too much seriousness can just as surely dry up a forum as too much frivolity.