Ok so i was thinking about this the other day and had a heated debate with a friend over it as well.
Vader does nothing to redeem himself
He takes out his master in true Sith fashion
As they all do , when the time is right the kill their masters.
Just because he did it while the emperors attention was on Luke is a moot point, infact that is a true sith moment , takeing out his master when he least expects it.
My other thought was
Spoiler for ep3..
..
.
.
.
.
.
.
..
.
..
.
.
.
.
.
.
.
.
..
.
.
.
.
.
.
.
.
.
No QuiGon is supposed to teach Yoda and Yoda teaches Obiwan how to merge with the force, who taught this to Anakin??How can this be?
The last thing i really want to know after reading the ep3 graphic novel was the look on Vaders fae when he was fighting Kenobi after the way he goes in the lava pit i gots to know!!!