Smithers said:
Lords of the SithMeh, not very well written and Vader’s characterization and dialogue didn’t suit him.
Some of the dialogue doesn’t suit him but remember this takes place like 5 years post ROTS so his character isn’t going to be exactly like the Vader we see in Rebels and in the OT.
I got that but it still feels wrong. He is referred to as “Vader” but nearly every line of dialogue is impossible to imagine with James Earl Jones’ voice. Instead, Christensen keeps coming to mind.