I'd imagine so, there is a comment system for a reason.
Although, most tend to stray away from long articles such as this one. Hacker News would benefit from a summation web application for articles like these.
I don't like the idea of curated comments. People aren't perfect and have biases. You may have set guidelines for what to endorse, but I guarantee endorsements are not going to be completely objective. Filtering comments and karma systems often become a popularity contest and not a discussion.