The two audition links supply evidence for the argument that the original actors, without any set design, props, costumes, matte back drops, and only what appears to be either a teleprompter or cue cards (or excellent memory), are sufficient in innate talent to supply more soul and earnestness to the dialogue than Lloyd, Christiansen and Portman can do under nearly the same circumstances. Under the worst performance conditions of the prequels, the prequel actors had at most a costume, some immediately nearby set design, maybe a prop. In their favor, they had some handicap of little preparation time, but it could not have been less than what the scores of actors applying for the parts received in '75 or '76. I would rather watch those two auditions with some random CGI blaster shots than sit through the worst of AOTC, which includes a lot of it.
auraloffalwaffle, I agree with your post. There's a slight increase in performance from ANH to ESB and a very noticeable decrease in performance from ESB to ROTJ. My tolerance allows me to let ROTJ remain in the fold rather than excommunicate it to the darkness, and to merely cringe in pain at some of the scenes, laugh with a release of endorphins, and move on.
Zombie, I owe you a debt of gratitude for clearing up a lot of things with "Secret History". It demonstrates how lightning struck twice, how the single-cell organism evolved into and was subsumed within the two-celled organism, how that new life-form was subsumed into a three-celled life-form, how an explosion of neurons or organs were whittled down and consolidated into fewer and stronger or at least expedient, and how revisionism seeks to make the ultimate adaptation - the effacement of the scaffolding supporting the ediface as happy accident is molded into epic intention. It's almost the exact same argument as occurs between evolution and intelligent design. Although your conclusions are highly forgiving (an understandable necessity for being published), your work allows me to see Lucas himself as the tragedy that he projects and banishes into Vader. The upshot of this is that it takes pressure off the actual movies for delivering "Tragedy" of any Shakespearean standard. The real story - that of Citizen Lucas - exists behind the movies and not in the movies.