The series got a little too liberal with the vader theme at times. Also Anikin's deeds are far too great of accomplishments to lead into what happens in episode III. Episode III Anikin still gives off a strong impression of someone who is still learning the ropes. Clone wars Anikin is very confident, is far more even tempered and rational, and his military accomplishments alone would have more than likely given him the rank of Master.
As well the whole >this is unfair it's never been done before
line just seems far too childish after we've seen what he's like in clone wars. Also it's weird that they have now connected all of clone wars to be fully canon, however all of his interactions with Ahsoka are left out of episode III. Regardless from where they've left off it makes no sense as to why he would even still care about the jedi. Clone Wars has pretty much turned him into Qui Gon. As both have more of a jaded view of the force, sith and jedi.