They fucked up Dorne big time. Book Doran, you knew he was a sly fox, he is playing a game- but what is it? You get hints, the marriage pact, but what else was he upto? It had an air of intrigue, just like the North. TV Doran, having cast such a good actor....the writers let him down.
I think S5 really suffered for being 10 episodes. I don't think they really nailed any of the plot lines, except maybe Dany's, and maybe Tyrion. Dorne and the North were such intriguing places in the book, you could sense the undercurrent of malcontent, you could sense the schemes. They didn't do them justice. Well, aside from the Wall scenes, those were pretty good, but I think it could have tied in better with the events in Winterfell. I really didn't like the direction one bit.
But Hardhome was balls to the wall awesome.