Not sure if this has been addressed in any way before, but it appears some of the pathing issues with castles and cities is a bit wonky. I specifically remember having problems in Bravvos. The troops don't seem to follow the logical path, and even get stuck on places. Makes a big difference when you are trying to defend or sack the city, as footmen or cavalry just get stuck there and mowed down by the archers.
Obviously less important than some of the other bugs, but something that needs to be smoothed over before the game can play properly.