Bingowings said:

This is were we have a difference of opinion.

It's a step in the right direction but even dying to save your son doesn't fully redeem even OT Vader.

If there was another episode in 1986 we could have Seb Shaw playing Anakin's ghost guiding his son to where he had done damage and helping him repair it.

Even if Lucas didn't want to do it the EU should have (there was a hint of that in the post-ROTJ Marvel comics before they finally folded).

I don't think it's important that the audience forgives Vader or thinks he's made up for everything. It's only important that he has an arc. A redemption can still be powerful even if you still wouldn't invite them to your Birthday party after.

After all, at this point, it's Luke's story, and in an ideal Prequel edit, it would be Obi Wan's.

The emphasis wouldn't be on Anakin anymore. The audience would be less affronted due to Anakin being a secondary character.

He also wouldn't be doing all these terrible things (or at least he wouldn't be seen blatantly doing them). You can show Vader being evil simply through his allegiance - marching with troopers, giving orders, etc. You don't need to show him gutting little children. Doesn't this make him easier to forgive in ROTJ? We never get the impression in the OT that he's anything more than a henchman. Why does a PT edit need to be any different?