Actually, I like quite a lot of the subtle jokes on HN. It is harder to notice, fewer to find, and I don’t get it many a times. But when I get it (or someone explains it to me, perhaps out of pity), I chuckle, laugh, and laugh again. And I remember those comments.
I think the occasional joke is fine but when you have too many then the comments get diluted. It's exactly that kind of thing that makes me hate Reddit and so many other places: spam.