Please watch this: (not my video)
https://www.youtube.com/watch?v=uRJaJQaCj5I
As you can see in the video the hands continue to "hold the ladder" (holding the air)
even after the character has already passed the ladder.
It does not place it's hands on the floor (roof) and pushes itself up.
Also when climbing down the ladder the character does not kneel down to to hold the
ladder and turn, it's just grabbing the air as if the ladder continue up above the
roof and instantly turns 180 degrees.
Looking at Dslyecxi's video from raven sheild you can see how it should look:
http://www.youtube.com/watch?feature=player_embedded&v=Hh7JdcpXt8M
It is really a simple animation that would make the game much more immersive
and polished.
On a side note, I think that pressing the vaulting key should drop you
from the ladder, in a case I am 1 meter above ground and under fire,
the animation is too slow to complete, in real life I would probably jump
even from 3 meters to avoid getting hit by bullets.