I really miss the comment scores.
Sometimes I am not totally familiar with whatever the original post is talking about, often the top rated couple of comments give me some good insight or jumping off points to look into it further.
I respect the HN community and have learned a lot here. I generally trust their judgement and I have found if a comment is rated highly, it most likely adds a lot of value to the discussion.
Sometimes I disagree with the highest rated comment(s). I then see my opinion is in a minority and maybe I re-examine it or stand firm and make a comment to the contrary.