Very entertaining. A couple of times I checked my watch, hoping the drama/tension wouldn't end.
Great scene with the red witch and seeing the very long line of Dothraki weapons all light up. Cavalry + fire gave the sense that they were going to put a serious dent in the dead army. All the more dramatic, then, when they rode out and the lights just disappeared. But weird that Ghost was there, yet not seen again.
As everyone says, tough to see a lot of the action with the night battle, but the cost of filming a day battle would have been really high. (I still cringe over a scene or two in Braveheart of fake fighting in the background of some scenes. A night battle avoided that.) They gave up on those flaming rock throwers rather quickly, didn't they? DIdn't like how all the top characters would be near-death, then get saved, and later in the castle they were each surrounded by the dead but able to hold them off (as Jon strolled by looking for ..I don't know what).
So are the dead slow, like in prior seasons and their advancing march in this show and their dramatic encirclements of Jon and of Jorah/Dany, or are they fast, racing down the Winterfell hallways in pursuit of Arya and her protectors? That seemed to be too much of a 'whatever suits the plotline' approach. Also, it sure looked like all the dead rose up again, but I thought the dragon glass weapons and fire prevented that - ?.
While I didn't like seeing the dead punch their way out of the crypts, the scene of Sansa and Tyrion drawing their weapons and sharing looks of doom was superb. I liked Tyrion's angst about not being engaged with the battle and possibly being able to offer battle strategy.
Arya rocks! But for all the build-up with her special weapon, she used it for about 30 seconds and then lost it in the battle ...and then suddenly became very fearful. The scene of her in the library, avoiding the dead, was suspenseful, if unrealistic with a ginormous battle raging everywhere else. (And the 'she's not under the table!' scene mirrored a scene in The Patriot.) Loved how Arya explained to Sensa how to use a knife. "Stab them with the pointy end."
Very nice kills by Lady Mormont and Arya.