I have mixed feelings, agree that the picture quality was terrible and the it was all so dark. I get why it was dark as its cheaper but if you compare this to the big fight in Lord of the rings: two towers which was also a night battle the LOTR was way better filmed.
That aside, the first part was annoying, why would they send all the horsemen to die alone, that was never going to work. So many main characters should have died, scenes of Jamie and the tall women whos name I cant remember standing against a wall with 1000's of walkers attacking and still surviving does not really follow with how easily the walkers killed the main human army.
Felt that Ayra should have become a walker to get close to the night king, not sure how she flew out of no where to kill him when he was surrounded by all his generals and a huge force!!
Apart from the glaring mistakes or bad ideas the overall episode was enjoyable, felt tense for the full time thinking how the hell can they win this.
Guessing the next episode will just be a recap of who survived then planning to head south. But did not look like many of them survived but they do have a dragon or maybe 2 if the other one survived