One PT thing that kind of ruins the OT to me is the "where is Padme?/ I think you killed her" part. Cause now every time Vader is saying something like "You don't know how powerful the dark side is." or anything like that, I'm thinking "Yeah, right, the power that made you kill the one you loved and the mother of your childrens..."

So in order to correct (a bit) this issue, I think that if we could find a way to have the Emperor saying "Obi-wan left her for dead. I burried her." (or a better line in that spirit). It would appears less bizzare that Vader stays with the emperor at the end. Cause his anger would be more focus on Obi-wan than toward himself and Palpatine. (I think I should/could have done that in my silent edit...shit!).