Seeing comment scores is useful, because it lets me easily see the "best" comments.
This is actually why I think comment scores should remain off indefinitely. People (including myself) have become too reliant on scoring as a measurement for the merit of comments. That may have worked when the site first started and had a small close-knit group of users. However, any site which experiences growth as HN has will inevitably become diluted for both quality of comments, and scoring, I believe. Yet, people will not adjust for that as they continue using scoring to inform them what is "best".
This is actually why I think comment scores should remain off indefinitely. People (including myself) have become too reliant on scoring as a measurement for the merit of comments. That may have worked when the site first started and had a small close-knit group of users. However, any site which experiences growth as HN has will inevitably become diluted for both quality of comments, and scoring, I believe. Yet, people will not adjust for that as they continue using scoring to inform them what is "best".