I've said it before, or at least something like it, and I'll say it again: I'd vote Vader over the last dozen presidents without hesitation. I'd prefer Palpatine, but Vader will do. Either of them have more political experience in their little finger than basically our entire political system put together, and their primary problem is with (force using) jedi and xenos, neither of which we have on earth. In their corner is holding together a galactic scale regime change, largely maintaining or improving conditions for humans on a scale dwarfing anything in current human history, and managing to only be ousted by terrorists with hokey space magic and battleship grade plot armor that
doesn't exist in our reality. If they can do that with hundreds upon hundreds of planets, consider what they can manage with only a single one.
Also consider that Palpatine (Vader's mentor, even if V largely left the big stuff to him) managed to get an entire goddamn
galactic senate to basically stand up and dance. We're talking shit that can't even physically comprehend human thought, and the guy still managed to get them on board with his stuff. You'd see congress scooting around like turtles with ICBMs shoved up their tukhus, and it'd be
amazing.
Also, I won't lie, I'd pay ten bucks to see a man in power armor one-arm choke some folks. Maybe not as good as a force choke, but watching the guy just kinda' stroll up to Kim Jong-un and find his lack of faith disturbing could be worth the price of admittance.
... though I guess to be fair, I'd be pretty alright with Mon Motha or Organa-Solo, too. People never seem to offer them as a choice, though
E: Though in retrospect, being desperate enough for top-tier competence that you'd endorse a set of mass murderers (and yes, that includes Mon Motha and Solo) each with the blood of millions (/billions/trillions) on their hands probably says something. Maybe about me, maybe about our political system, I'unno. Still. It takes some hella' administrative and political skill to bury worlds worth of bodies and come out with huge chunks of a galactic polity actually supporting you.