They are mostly rehashing old arguments against HN (still valid, just not particularly insightful): Apple fanaticism, the fact that there are less code-related news as time passes, the hellbanning system, etc.
I think the real story is that as usual anything that involves 4chan gets upvoted to the top here, indicating there might be some significant overlap between the two userbases, as much as they might both dislike it.
You mean like /b/ was, by the end, supposed to act as a buffer on 4chan to keep out the new posters from the other boards while they were still adjusting to the local "etiquette"?
That worked for a while, and then when that board became so bad that even new users wouldn't find any enjoyment in posting in it, they simply stopped lurking and carried over their bad habits to other boards. It spread through the whole site at an alarming rate. You can't try to separate the good content from the bad, or at least not for a long time because the bad always finds ways to spread, and I doubt the separation into "sub-reddits" instead of boards has any meaning in this case.
Wikipedia was created and is hosted in the US, the Wikimedia Foundation is based in the US, Jimbo Wales is American, and I'd wager a large part of en.wp visitors and editors are American. Like it or not, Wikipedia itself is US-centric.
And though it may be besides the point, you know as well as I do that if SOPA happened to pass in the US it wouldn't be long before most Western countries had their own version too.
While I agree with most of the points the author makes, I can't see why he would concentrate on video games. It's not much harder to be addicted to the internet, or to anime or visual novels (see the Japanese hikkikomori), or to anything else that we can play/watch/do alone in the comfort of our own rooms. And these other addictions have much the same effect as those the author describes. In fact, I'd wager that most people who have played a game like Diablo 2 or World of Warcraft for a long time don't continue to do so because of the game itself, which has lost its immersive quality for a long time, but rather because of the friends they made, and the alternate society they are a part of. The greatest danger of MMORPGs is in my opinion that they are social games.
Given how many people use the internet, I think it is a miracle it survived mostly unregulated for so long. I personally do not doubt it will slowly be assimilated by society and progressively get locked down, but it is in my opinion a testament to the first real users of the internet, and to 'geeks' worldwide that they fostered a culture that made it possible to call the internet a modern-day Wild West for a time.