Ronster said:

Do you think that a good side ghost of him is the redemption?

I don't think that is the redeeming moment... It is when he says "tell your sister you were right about me."

And saving Luke

The ghost is like I said wrapping the neat bow around it all... If anything it's over sentimental but I think messing around with it has made it a lot worse.

The redeeming moment is when he destroys Palpy at the cost of his own life.....everything afterwards is just wrap-up.....but it IS needed as it is the end of Anakin's story. We see that he gave his life.....and then we see that in doing so he earned himself a place in the afterlife. It's more than just a neat bow....it's a part of Anakin's narrative.