It would be great if the native comments system could be updated to include at least some of these "extra" features. It's 2014--people are used to being able to "like", "+1" or otherwise upvote/downvote comments. Sure, it has a tendency to turn threads into popularity contests and flames comment wars like nobody's business but welcome to the Internet. That's just how the average Internet user's mind works now, and the native Wordpress comments system is falling behind. I doubt many people would want to bloat their site with extra plugins otherwise.