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Aesthetically, this one is a total gem: Peep the elegant sleeve holster, the gold shading on the hilt. But doesn't it just feel weird to see the Emperor use a lightsaber? It's like seeing Jimi Hendrix play the electric bass — sure, he's probably pretty good at it, but you really just want him to break out the lightning.
There's bad luck, and then there's what happens to anyone who fights with this lightsaber. Anakin Skywalker uses it in his battle with Obi-Wan, and ends up a dismembered, charred shell of a man. His son Luke inherits it and promptly gets his hand cut off in his very first duel. (And after that, he receives the devastating news that Vader is Anakin.) Finn picks it up, and gets his ass kicked by Kylo Ren. Only Rey is immune — like color blindness, does this lightsaber's bad mojo mostly affect men?
Is casting an 80-year-old man as the greatest swordsman in the galaxy a little bit of a stretch? Sure, but if you've got a chance to put Christopher Lee in your movie, you don't throw it away. Instead, you give him a sweet curved lightsaber, make him (and his stunt double) move as little as possible, and do some hand-waving about his graceful Makashi Technique. The sleight-of-hand works well enough that you don't even question Dooku absolutely destroying Obi-Wan every time they duel.