Don’t think a lot needs to be said as we can all see our scrawny Batman and a short stocky Bale.
Wait, huh?
Bale is a LEGIT 6'1 (stood next to him, I'm 5'11) ... that's w/o the Bat-suit. With the Bat-suit he is over 6'2 slightly. Comic Wayne is 6'2. There isn't a huge difference.
Keaton, the last serious interpretation of Batman, was a 35+ year old, scrawny, 5'9 ... not very handsome, going bald interpretation of Batman. Clooney was even shorter, Kilmer, the tallest but has no phsyical presence. He's got the surfer boy look, and it isn't intimidating in the slightest.
Bale is the only one who is the perfect storm. Acting wise, and physically. He has the intensity in the eyes of Keaton, the interesting look of the face ... the sharp angle cheek bones looks down right frightening, the handsome looks to be a playboy of Clooney and Kilmer, and like I said the first Batman actor to have a physical presence that is intimidating.
Even in non movie based photos, on set, in borad daylight no less ... he looks actually menacing. Bale as an actor is a very intense guy.
But the physical potrayl extends beyond size. It's mannerisms to nuance a performance. Bale's Batman doesn't stand and walk in a normal fashion akin to the previous 3 actors (though in Keaton's case, the costume limited him greatly, you can even tell in the few action scenes that isn't him doing coreography for the fights in the suit ... it's actually jarring as you can tell it ISN'T him) ...
But Bale's physical potrayl is in his acting. He presents Batman as an actual creature, not just some dude in a suit. The growl (however polarizing it might be), crouching on railings and rooftops, him hanging upside down before attacking (like a bat), attacking from the shadows then retreating, the use of the cape as bat-wings ... he presents himself as a man / bat creature. Even when walking he has this lean that indicates he is always ready to pounce on you. As if he's on edge.
Ledger's Joker, has nuanced mannerisms too. He's the tallest actor to play the Joker. He's wirey and lanky like the Joker (he was about Bale's height), but he also had a raw physical power about him that the original interpretation of the Joker had in Batman #1. He can handle himself. The creepy limp walk, the slumping of the shoulders. He added the nuance of licking the scars and lips, which is a characteristic people with that type of scar actually do ... and it adds to the whole "mad dog" angle, someone hungry for chaos and violence.
Neeson's Ra's, carried himself with a nobility, and superior than thou physical performance. Very much reflective of the character. Great posture, etc.
Now Bane, we get a dark reflection of Batman. Having seen the prologue and trailer, he too has the same posture of looking ready to pounce on someone physically, but it's the coldness in the gaze, of someone who simply doesn't value human life. Almost machine like (plays into the mask and anesthetic that makes him feel no pain) ... the voice that sounds mechanical and soul-less.
All brillaint actor potrayls.