While Ledger and Eckhart get the glory. (and add Oldman for completely DISAPPEARING into Jim Gordon) it's BALE who anchors this movie.
He is so awesome I dont think people have had a chance to step back and actually understand the impact Bale's work has had on them. In fact it's the things that people DONT TALK ABOUT that illustrates Christian's total mastery of the role. Consider just 2 things:
1) Remember a time not so far back when people would engage in HUGE threads about which was the "real" Batman and which was the mask? Is Bruce Wayne just a mask and Batman the real character. Or is Batman merely a persona for intimidation for Bruce Wayne? Such discussions now strike viewers as trite and contrived... like we've moved PAST that because Bale's performance makes all parts of Bruce's psyche relevant to the character. When Bale's Bruce Wayne talks with Alfred or Rachel you can feel the pathos and pain the man lives with... and the enormous weight of the responsibility. When Batman growls at his enemies you feel real menace and anger, it's not Bale or Bruce playing at being Batman, at that moment that's who he IS... a torrent of primal rage and vengeance and juuuuust on the edge. I mean when I first saw BB, Batman felt... violent... when's the last time you saw an actor play Batman who felt violent. Past writers and actors have played it as an 'either-or" scenario. But Bale's performance makes you subtly understand that these are true aspects of a truly troubled but noble man. Bale's singlehandedly shut down discussion about an area of Batman's characterization and impacted the perception of the character so fundamentally yet subtly that most people dont even notice. That's badass
2) Furthermore Bale's extended the lexicon for Bruce Wayne... he's expanded his portrayal from what was traditionally 2 "either-or" characters into 3 fully developed separate characters: Private Bruce, Public Bruce and the Batman. He makes all 3 so believable. Even for Michael Keaton... his public Bruce persona was only slightly differentiated from his private Bruce.. for example when he was dealing with Kim Basinger his Bruce was still basically the same person as with Alfred or the public.. cocky, bit twisted but still the same guy. In contrast, Bale makes even his Paris Hilton persona very real... remember that it's not ENTIRELY a mask... he WAS truly that guy for a period when he was getting kicked out of Princeton and wasting his life... it does come from a real place contrary to people thinking it's totally just mask. And the way Bale plays it you can still see that connection.
To me it's amazing how well Bale understands the character, even better than writers like Jim Lee. Often you have scenes from Lee where Batman is sitting around in his Batman costume minus the mask growling at Alfred... like Lee cant quite get his head around where each character ends. You really dont get ANY of the from Bale. He understand that ALL parts of the character are Bruce but he never gets muddled as to which is which or what part of Bruce is talking at any time. And all this is totally seamless. Even compared to Ledger and Oldman, there's no question that Christian Bale is one of our best actors