Gotta say, I'm a bumbling 2her, and I hate this idea. Ladders add an entire new level (literally, you put up a ladder and a new level of the map is opened up to be played on) to the battle, and changes the dynamic from being what was solely intended by the map developers into a dynamic which at least gives the illusion of the freedom of choice to players (because we all know that ONE roof on that ONE desert map will be the only one camped). Maybe sharply angled roofs are a bit iffy, simply because I'm not entirely sure myself if you can apply draw to a bow with enough force and not fall off, flat onto your face, and then get trampled by an elephant...but as it is, ladders are fine, and I say keep them in battle.