I'm definitely not saying the prequels shouldn't be focused on Anakin. I think that's right, and the way it should have always been. It's the story of Darth Vader. That's why they exist. But it's jumping into forbidden territory when it tries to claim the original movies too. It simply makes no sense to say that Star Wars, The Empire Strikes Back, and Return of the Jedi feature Darth Vader as the story's protagonist. If that was the case, they come nowhere near accomplishing their goal. It's obvious they weren't meant to feature him as the main character, from the fact that he's not as prominently featured as Luke/Han/Leia/etc. to his placement in the end credits*.

*Coincidentally, I've always felt that the actor who played Anakin should have received top billing in all three prequels...