Ironically a lot of people wanted Vader 2.0 but didn’t at the same time. They wanted a calm, mature and menacing master of the Dark Side but they didn’t want Vader. That would be a rehash 😉
My problem with it, is that this way we got no actual threat to the main characters, making TFA very boring to me. I would’ve not minded another villain besides him, an actual threat. Giving a more important role to that FO-commander-guy or Snorke, would’ve probably been enough to fix this.