I think they could work under certain circumstances. But unfortunately I don't think the circumstances would ever come to be. For siege yes, but they'd need to balance every map for them, as ladder paulting directly to the flag is pretty shitty for defenders. And for battle I think archers camping roofs could be a problem, maybe make it so you can't destroy the ladders so you can always get to them. Archers placing a ladder, getting to an otherwise un-reachable place, then destroying the ladder thus making them un-reachable, is pretty lame and pretty common. We don't all carry ladders and we might have already used it if we do.
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