Good question. I don’t know why I’m tackling this question because I know someone will come along and express it a lot better than me…but here I go:
I don’t necessarily think everyone feels the same way. I also don’t think it’s cut and dry either.
I like the original performance in ESB.
I also appreciate why it was changed - now we have consistency with the same actor portraying the same character in the saga. With that said, I don’t like the altered dialogue nor do I particularly like Ian’s performance.
Now Anakin is a different story. It’s not just disrespectful to Mr. Shaw. It alters Anakins redemption.
Prior to this change, Old Anakin simply transformed into force ghost Anakin…with only battle damaged removed.
Now, going by visuals alone (this is a movie, after all) Lucas is essentially telling us that Anakin was redeemed and transformed to his pre-Sith days. That was when he was last ‘good’ and not evil.
I think the logic behind the change is probably that Anakin hasn’t done anything good in his life since his Jedi days and therefore the force is sort of “erasing” the Sith days from his life. Hence, he looks young while Obi-Wan and Yoda look old.
Since this change, my thoughts have been: Anakin WAS redeemed as an old man, therefore, he should be an old looking force ghost…for lack of a better way of putting it.