Submit articles you think are interesting, upvote those you think are interesting, flag those you think aren't appropriate for the site, contribute comments which move the discussion forward in substantive ways, flag/downvote those you think aren't appropriate. Those are pretty much the tools we have at our disposal. Things we don't like are easy to see. Help create the site you want it to be. It does take more work, but I think that's the main way forward.