Oh, but I do think it isn’t a particularly funny line precisely because it’s a Vader line and it’s too long and forced. “It has the power to create problems” is shorter and flows better, and sounds more like something Han could say.
It also does not help that the Mustafar scenes are filler, as they do not advance the plot or give information, so I don’t really like Vader in R1.
I don’t much like the scene either, and I don’t find his lines all that funny there. What I meant is that he is funny in the OT, so going for funny in RO wasn’t an inherently bad idea.
Okay, now I understand your point. I agree with you here; I wasn’t saying I have a problem with Vader being funny in R1, it’s the execution and context what makes his appearance a rather poor imitation.