I loed that finale. I did have one quetion though -- I'm no Tolkien expert, but didn't Suaron call himself something else (Annatar or something?) when tricking the elves? Or am I misremembering some half forgotten discussion? Not that it matters, and I suppose that would have given the game away.
This is something... I think they needed to change given their own change to the story. Annatar is a quenya name. It is consistent with the story from the the books "Hello, I am en emissary of the Valar, I am a favoured of Aulë the crafter among the Valar, and I am here to help ", so it was coherent for him to have a quenya name as he was supposed to be from Valinor. And it was correct-sounging for the Noldor.
Here, he's a "man from the south". Even Numenoreans had stopped using quenya name for their kings for generations (or since a few month, due the timewarp), so why would some random Southerner bear a quenya name? It would sound... fishy. Especially when the name means Bearer of Gift. Even an averagely gullible Noldor would expect him to try a Nigerian scam...