Mostly though, the Diologue was okay for a film. Some stuff didn't work (politics stuff and a bunch of Anakin's motivations/speeches), some stuff worked (Yoda's advice, Obi-Wan's final speech in EP3 to Anakin), and some stuff REALLY DIDNT FUCKING WORK (every line of forced romantic interaction between Anakin and Padmé, nearly all of Anakin's freak-outs.)
But most of all, the worst Diologue ever in these movies can be summarized in 4 words:
"Are you an Angel?"
As Palpatine once said in the Robot Chicken parody:
"Darth Vader, everyone..."