Diamondeye
So Happy I Could Die
True enough, though the extrafor muskets are free if you're getting them through drafting.
As was mentioned before, the combat odds change significantly if there are any crossbowmen defending your enemies' cities. That would almost necessitate using Musketmen.
Musketmen also have very flexible promotions. CR is nice, but a Drill-promoted Musketman can also serve as a fine city defender once the dust settles. If you're using siege as your primary damage-dealer, then drill is as good as CR anyway, and in some cases better.
Agreed, against Xbows and as defenders, muskets > Maces.
And I love the drill promo aswell, the problem about it is that CR kicks in from promo 1, whereas you need DIII or IV to be worth it compared to combat, IMHO.