I think another difference between MTW, STW and RTW which has been brought up before and is worth noting is that it seems like all the archers can fire at once in RTW, whereas before it was only the front 2 ranks. This makes comparisons of damage effects etc that much more tricky. That said though, I rarely have missile units run out of ammo before the battle ends even though they're all firing more arrows per volley - I guess because the combat is over that much faster in RTW?