No I wasn't having a go at Brith. I was agreeing with Angelus' point which was basically "it's Lucas character" and we don't know that much about Vader. Even Lucas himself said that Vader was really just "the bad guy" up until the end of ROTJ. He is a very vague character.
All the other stuff is just assumptions made by us. And over the years these have been accepted as to what actually happened to Anakin Skywalker. But what do we know about Vader? Nothing really.
He was a good kid turned bad and that's it. We know he was "seduced by the dark side" and that the Emperor was involved but not much else.
To accuse Lucas of re-inventing the character is to say that what the fans assume happened to Anakin is true. But we don't know. Lucas can't re-invent Anakin/Vader and change the story because there is no story or character to re-invent. It hasn't been told yet.
All we know about Vader in the OT is that he is evil and the bad guy. That won't change. He's still going to be torturing Han Solo, helping to destroy Alderaan, cutting off Lukes hand. He's still the bad guy.
But if what you assumed happened to Anakin is different from what happens in the PT then it's not Lucas fault.