The following post is written from the perspective of SP balance rather than MP.
a) Skirmishers can beat Line Infantry if they get a good position and are allowed to use their increased range to get a volley or two off. They lose to Line infantry in hand to hand however, and will lose in a protracted firefight.
b) Line infantry do very well against cavalry. Musket fire is about as powerful as you would expect. From close range it can kill a lot of people, from further away it isnt as effective. Musket fire will probably be what kills most people in a battle, rather than melee. Melee is strong but not as strong as it used to be in Med 2. They move at a reasonable speed, perhaps a tad too fast.
c) Light horse will not break a unit head on. Rear charges and flank charges are more difficult to pull of given that units can shoot back, but they will break enemy morale. Unless the neemy form a square, in which case they are much less effective. Light horse are very, very, very quick. Indeed all horses are. They probably need slowing down somewhat for the actual game.
d) Artillery is easy and pianless to use and deploy. Canister is devastating at close range and not so much at distance. Roundshot is powerful but not overpowered. Artillery is to be respected, but an army of nothing but cannon would quickly lose. They are reasonably accurate in a counter-battery role although that is hard to judge given that the demo pitches 2 units of 6 pound horse cannon against much heavier American 24 pounders.
Fatigue is not pronounced. Speed is more or less right for infantry, cavalry are too fast. Morale seems to be spot on.
Hope this helps.

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