"They should have used Annatar in season 1 instead of this random human guy!!!"
"Why are they using Annatar in season 2 instead of that random human guy?!!"
Superman can get away with it, but not the extremely powerful evil entity that's known for deception and manipulation, I suppose.
Tolkien's shit is THE definition of "generic fantasy." It's where all the tropes come from... The hell do you expect this to look like? Basically the only difference is the awkward dialogue they feel obligated to use. And if you don't believe me, rewatch Jackson's LotR again. The stuff those actors had to say was a mouthful most of the time.