Eh, an aliens gestalt Intelligence taking over the body of a powerful human telepath and using his a abilities to take over the human race via manipulation is a very GRRM ending. It was not presented well here, because it was neither obvious that the Three Eyed Raven (for clarity, I won't be calling him Bran) was in fact manipulating the events which led to his election (he clearly was, but it wasn't obvious to the average viewer, hence the failure) nor was it unambiguous that the Three Eyed Raven was not Bran (though they did beat us over the head with this one, so I'm not sure why people are confused, but clearly they could have made it more obvious somehow.