just... Bran
I don't hate the finale like so many. It's not my favorite, but it doesn't bug me. Game of Thrones was often a show where a season's penultimate episode was the most thrilling, the climax of the season if you will, and the finale more a denouement. So I wasn't surprised.
But... Bran. I mean really? That bugs me most. It's hard to argue he has "the most interesting story" when they benched him for Season 5.
Beyond that. He might (?) have an extended life due to being the Three-Eyed Raven, which doesn't seem like something they'd be searching for in a new monarch of Westeros.
Also, he's all-knowing, and could keep secrets to have things go how he wants. And he can't really be made to answer to anyone. I don't think these are necessarily things that any other characters or people in the audience think really *would* happen, but the fact that they *could* makes you think they'd steer clear for sake of decorum