I'm not saying one is better than the other, but there is a tradeoff. On Reddit, you can be rude, and people can downmod you, and it doesn't matter once the post sinks. Here, if you act like an asshole, you get downmodded, and your karma suffers. But even if you make a well reasoned, but controversial comment, you often do still get downmodded because of your unpopular views.
Not that I comment here often, but I'm at four down from seven at one point, and it's really the logical consequence of such a system. It seems to work here, but I do wonder, as Paul expresses near the end of his article here, does this technique scale?