Red Superfly
You creepy little stalker
Hayden was good as Anakin, but only in III.
Lucas wanted a guy who looked like a bit of lovable rogue. Anakin was supposed to be Luke but with bits of Han's rebelliousness and guile. Lucas stated he was going after a James Dean-type of actor.
If you have seen James Dean, you will realise Hayden looks a lot like him.
I personally think Lucas failed completely with Hayden in Episode II. Lucas chose the right guy for sure, but a combination of the story, the make-up, the hair, the directing of the character, gave the complete opposite vibe of a James Dean-type Jedi. The ingredients were right, but something went wrong.
Episode III however - Success! Anakin looks and acts like James Dean, if James Dean were given a lightsaber and a robe. The effects/directing did work against him, but in the end, Hayden was a brilliant choice.
I think the biggest mistake was waiting for two whole movies to show us the real deal. I have and always will consider Episodes I and II to be pointless. Lucas should have stretched out Episode III and made an OT-esque trilogy revolving around the bad ass Jedi known as Anakin. We didn't need to see his whole life, just like we didn't need to see Lukes. Hayden was a good choice, simply because he fits the criteria Lucas was going for almost perfectly, but we only "got" what Lucas was attempting with him in Episode III.