Face value for me at the very moment I watched: "Ah..; of course the Night King know the dragons are coming soon. That is why he is waiting. He wants to kill a dragon." Then he caught one instead, and his plan made even more sense to me. The whole fight therefore made perfect sense to me: why the wights waited, why they did not quickly overwhelm the adventuring party, why the Night King had chains and magical javelins ready, et cetera. Nit pickers just pick at tasty nits instead of stopping to think why.
9/10 for great television. My favourite parts were the Child of the Forest and the skeletal Others because I always enjoy the fantastic and the fey; Brienne's fight with the Hound because it was tense and exciting sicne its outcome was unknown and not in the books; Arya's boat ride to swelling choral accompaniment because there has to be some joy even in the grimmest life. The grief of the father of the child burned by Drogon was moving. I can patiently wait for the undead Stoneheart. I do not mind Tysha being combined with Shae on television. I do wish that the knights in this show looked more traditionally knightly, that is to say, I wish they wore heraldric surcoats and colours. Stannis's knights looked very drab and dull. I much prefer a more mediaeval appearance for a knightly charge.