The two main gripes I had with TW: Warhammer were the limited siege battles (beautifully fixed for ToB) and armies tending to reinforce from a direction that didn't tally with their relative positions on the campaign map.
I've had four battles in Thrones so far where this has occurred. One bridge defence (got quite a shock when the second enemy stack rocked up to my rear), two battles in open field and one siege. It can really present a problem with realism mode enabled since it's very hard to jump between opposite ends of the map without a pause function, especially if your reinforcements are coming on from the same side as the enemy reinforcements!
Anyone else having this?