It makes for boring comment threads when people post comments saying something shouldn't be on the site That's true, it does. But if downvoting is impossible,

It makes for boring comment threads when people post comments saying something shouldn't be on the site That's true, it does. But if downvoting is impossible, commenting that it shouldn't be here is frowned upon, and flagging is reserved for the most egregious cases, what is the appropriate thing to do when you don't think an article doesn't belong? (NB. I don't think this article belongs in that category. It's not a great article, but it's perfectly on-topic, and not, as far as I can tell, spam.)