Yes. I think a simple tweak of having two ways to vote could be an interesting new dynamic: agree/disagree and valuable/not valuable. That way you can express that you disagree with a comment but still upvote them for furthering the discussion. And you can hit the "not valuable" button for insults, trolls, fluff comments, etc.
Now if they only allowed us to downvote stories, instead of relying upon tags such as "slashvertisement", "dupe", and whatever we tag those ridiculously-overhyped headlines...