Slashdot's wrapper commentary hasn't been clever in quite some time, unfortunately. I had a very low uid there, and witnessed the decline firsthand. Count me in as someone concerned about editorialized headlines at HN -- I really don't want to see it go the same direction as /.
The spirit of that guideline is that a link should speak for it self. If it can't, don't submit it. If YOU want to say something, write a blog post.