the best thing about GOT is -
It's not a fucking superhero film or a fairy tale where good always wins over evil. In fact, here you don't have any pure good evil character - everyone has a bit of good and bad in them.
Someone asked - how will avengers end? I know the answer there. With this show.... I'd argue that we'll get a much more complicated answer, if only because the characters in this show are by far more complex than they are in any fucking superhero movie.