So instead of 'up' and 'down', you have a clickable emoji-menu like list of tags like 'interesting', 'boring', 'funny', 'WTF!?', 'Quality', 'Trash', 'Educational', 'CAT', etc...
I'm not sure about this. How do you decide which qualities users can rate? How do you ensure those qualities work across instances with different languages / cultures? You're also taking something which is extremely low effort and making it take significantly more time and effort. I think the simplicity, universality, and low effort of upvote / downvote are all strengths.