All I can really say is it just doesn’t gel with his actions in the original for me, I tried articulating it but couldn’t really get the words right. You’re correct in not being able to think of a single time Vader using his lightsaber in other situations would have worked, but I would think that would help in saying it doesn’t really work well here. Would Vader go on the boarding party in the first place, is the real question? Every time he appears in action, like on Hoth or the Tantive, he’s there after most of the work has been dealt with. Yes, there’s the time element, but to me it’s not something Vader would really do. Nothing suggests to me he’d go apeshit either, Vader has always been a character on the verge of outward rage, but acts on it in a very collected manner.

I’m not really sure how to better explain it. I think my biggest issue with it is it looks like a video game and goes on far too long to make him look awesome when it’s not really earned in my view.