Another problem is what the comments are about. It's more a matter of Objectivity vs Subjectivity. At first the point of a comment is to give a point of view about the article and then discuss about it. I have found that now it is more a matter of who has the best point of view and that if it is contrary to the majority; it will fail. Thus resulting in multiple pointless comments, giant upvoting for the one who "blasts" the one with a different point of view and so on.
Filtering may be a solution, but if the problem can;t really be solved with an algorithm due to the human nature, it is a matter of a longer brainstorm...