I love that Arya killed the NK, but there was something that bothered me.

The White Walkers have been built up as this looming existential threat across the entire series. The very first episode opens with the nascent WW army. And yet that entire eight year set up is resolved in a single episode? Even in GoT, which delights in disappointing its fans, this was a bit much.

It was established last season that each of the WW lieutenants had created their own wights, not just the NK. I'd have preferred that the NK is defeated but that the WWs carry on in a much reduced capacity. That way Winterfell could be saved and the WW could still threaten.

Ah, still a great show, so long as Cersei gets what's coming to her!