A few more things to consider also:
* A single soldier who has charged off alone into the heart of the enemy formation can survive for ages because the new animation/combat system only allows for 1v1 fights, in reality you would be stabbed in the back, side, other side, front, back again and die.
* I agree with previous posts on cav:
"Cavalry still had an important place on the battlefield and yet even this veteran symbol of the samurai had been relegated to a supporting role by the time of Sekigahara. Like guns, horses tended to be difficult to acquire in large numbers, and unlike guns required both a high degree of skill to use in a military capacity and were even logistical burdens."
* Similarly armed and armoured units should have similar stats: Katana samurai absolutely destroy teppo samurai even though once in melee it's difficult to tell the difference between the two (both have katanas and the same/similar armour).
* Buildings seem to catch fire as though they've been soaked in flammable liquid of some kind - even the castle walls (large, thick tree trunks) will go up with only a few fire arrows. If you throw a similar sized log onto a huge fire it takes a few minutes at least to catch properly.
* About the wall climbing: I think the big problem is how passive the defenders are. In reality you would find it very difficult to
climb up a wall while being shot at by archers and stabbed by spears from above. I know very little about Japanese siege history but it would seem that breaking down the main gate would be far less costly than climbing the walls. This was a problem with Empire as well, the defenders just let the attackers climb up. That's one of the reasons other nations developed siege towers isn't it? So your forces have a chance to break through instead of being killed one by one? It would appear they
did climb the walls however, but it was usually a stealth attack while the bulk of the defenders were at the gates or the wall assault was spread out to thin the defenders which would make assaults on the gates much easier (granted, that last bit of info was more like 5th hand info so who knows
.
I'm not so sure about the effective musket range now, since 80-100m could potentially be the effective range against a single target, whereas when used in formation against another formation the range could be higher?