A good end to the season. The final scene wasn't climactic, but served as an essential counterpoint to the Red Wedding.
I don't like the way they rushed through the Dragonstone story line, and Stannis comes off once again as more evil than he is in the book, where he agonizes over the decision to sacrifice the boy, and I thought Melisandre's reaction to the letter, as if it was a revelation to her that the White Walkers are the real threat, was out of character.
Ending at the midway point of the book left the problem of how to give all the story arcs a sense of closure at the end of the season, and for the most part I think they pulled it off. I have a feeling season 4 is going to be where the show and books begin to diverge dramatically, because they are obviously inventing a new story arc for Ramsay, Theon, and Yara, and will need to expand several characters screen time, particularly Bran.