I wasn't a fan of the "Nooo" initially, but I've gotten used to it being there and it does serve as an odd little bookend to Vader, being among both the first and last things he says with that mask on.
I will always maintain that Force Ghost Hayden was both a necessary change, and an objective improvement along the same lines as putting McDiarmid into tESB. It just makes total sense from both a character and emotional POV. Sebastian Shaw was 78 (a clear decade older than Guinness, BTW!) when he played what we now know to be a 45 year old Anakin. That aged appearance wasn't natural, and it'd be weird that his self-image would be how he would have looked had he lived until the next Rey movie.
Within the last year, I took someone through all of the Lucas era movies for the first time (in the machette order, because I was curious to see how it landed), and let's just say they got very emotional when Hayden appeared. Old fans can grumble all they want, but it packs way more of a punch that way.
Indeed, their reaction or non-reaction to a lot of the changes is really eye-opening. Not knowing there were changes at all, they just accepted them all at face value. I asked afterwards and they said that nothing felt jarring to them. Not the Jabba musical number, not the Jawa physical comedy, not the maclunkey, not even the weird CG blinking ewoks. It all felt of a piece.
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