Can you point to one of his articles that is trollish, instead of just unPC?
There are a number of articles with this sort of tone:
http://www.vdare.com/sailer/051016_football.htm
"Or, possibly, the reason that teams with a higher number of white reserves have been winning more games is because whites are better team players about sitting on the bench without complaining about not starting. Perhaps white back-ups are less likely than black back-ups to poison the atmosphere and ruin the team spirit."
How could you possibly argue a point like that? It's pure trolling.
Anyways, I don't know if he's trolling a whole 90% of the time, but certainly < 10% of his articles are appropriate HN material.
This article, however, made a very salient point, which I have heard from other people as well, particularly in regards to the conflict in South Ossetia. (Basically, he says that the American media is too sympathetic to English speakers around the world.)