I love the idea of badges!!
It's kind of like some forums do where once you make a certain amount of posts you get another star and a new rank name (examples 1 post - new fan, 100 - part-time fan, 500 - dedicated fan, 1k - loyal fan, extreme fan, passionate fan, idol fan, supreme fan, elite fan, legendary fan etc.) Except it'd be based on how many dramas you watch and what countries the dramas are from and the numbers to make the badge goals would be way smaller.
On a personal note, I think badges would also help me be more motivated to watch more because I love collecting badges!!