I thought the reveals around Adar and him literally being the father of the orcs was very well done. We’re seeing a new side to Tolkein orcs that doesn’t in any way reduce the horror, but showing glimpses of pathos. In fact it increases the horror. Seeing that tortured elf/orc/uruk and knowing that the orcs were fathered… not bred. Is powerful.
The creation of mount doom was cool. I particularly like how the sword holy when entered into the keyhole looks just like Barad Dur. The defense of the ancient keep and the damn was a nice detail. I’m really looking forward to how they finish things off… presumably reveals about the stranger who is clearly Sauron. I don’t know where people are getting the Halbrand-Sauron idea from - when it is so clear that he is the stranger.