I agree with the fact that this is Lucas' film and he can tinker with it until the day he dies (and maybe even from the grave if SW is forever). It doesn't mean I don't have to like everything he does or buy every new version he decides to put out. I don't like all the changes because some are pointless and seems to detract from the overall story. Maybe because I've seen it a million times and can quote each scene. Other things, like the Death Star battle and making the TIEs and X-Wings do smooth acrobatic manuevers were awesome touches. But some people have mentioned Vader leaving Cloud City and how it breaks the momentum of the escape... and how awfully mixed Vader's theme during the hurried strings during "Rescue from Cloud City/Hyperspace". I never once thought "hey, how did Vader get on the Executor?" It was assumed. Leave a bit for the viewers' imaginations. I still don't understand why it's Hayden that's the force ghost at the end of Jedi and not Shaw. Vader returned to the good side once he killed the Emperor and since he redeemed himself in his later life, I would think it would reflect that age he died (did they consider Shaw too old?)
I guess the thing is I want to show my kids the Star Wars that I fell in love with in the 70s/80s and not the redeuxs. While it's the same movie, it's not.
As for the Vader "No. NOOOOO!!!" addition? It comes across kind of strangely on first viewing. Especially if you've been watching ROTJ on a regular basis since 1983. But there is a flipside to this story. The novelization of ROTJ indicates that there is more strife between Vader and the Emporer than the movie lets on. And the final cut of the movie doesn't indicate it as well as it might, since the scene with Vader, Moff Jerjerrod and the Royal Guards was cut.
So what did we get in the theatrical cut of ROTJ? One scene where the Emporer tells Vader that he was to have stayed on the command ship. And then Vader looks on as the Emporer is using his Force lightning on Luke. The Vader mask doesn't allow the viewer to see any kind of inner conflict with Vader. This is where the additional dialogue comes in. The whole "No. NOOOOO!!!" thing expresses Vader's conflict, and harkens back to Lucas's use of recurring themes. It doesn't feel right at first viewing, but it makes things work a little better from a story standpoint.
Nick makes a good point here about how the novel plays out the tension between the Emperor and Vader. I read the novelization several years after seeing Jedi and it clarified somethings. The scene when Vader tells the Emperor that he has sensed Luke on Endor, the Emperor is mystified and says
Strange, that I have not. I wonder if your feelings on this matter are clear, Lord Vader.
It's kind of lost that the Emperor sees Vader and Luke as a threat to him.