I think this is a matter of better staging/ a more elegant use of the tech. I doubt the Death Eaters are actually a higher class of animatronic-- they've just got masks on. They're not trying to convince you that you're looking at a human face, which is a huge leap across the uncanny valley.
Anybody else feel like you got transported into an episode of "Breaking the Magician's Code" in that first archive room with the death eater? Give me a masked magician in a warehouse and I'm back to primetime Fox in the 90s.