Probably the worst part is the time-sink and the predictable nature of the comments. Most of the time I can tell from the title what all the comments are going to be like. Anybody that tries to swim against the stream, if only a little bit, can be mercilessly punished. In fact, it's somewhat of a game to see how even-handed I can make a thread -- human hacking. Which makes it even more of a time sink.
HN has changed for me from being a site where I can hang out with fellow hackers to being a site where people I like hang out and spend too much of their time. I'm trying very hard not to make the same mistake. Hopefully I won't be joining Matt. (Lunch is over. Back to work)