Weak cavalry?

[Aracnid]

Not if you use it sensibly. All MTW units can be put into four groups, missile(incl missile cav), cavalry, spear infantry(pikes, billmen, spearmen etc.), sword infantry. If you use missile units to bleed the enemy and then fix them frontally with spear or sword infantry, then you hit them from the back or side with cavalry, if you do it sensibly no unit can stand being bleed, fixed and flanked unless it is vastly better than your units and even then it shouldn't stand up to you.

Edit: For example the English are going to have good missile troops and infantry, but their cavalry are going to be weaker. The French will have great cavalry but weaker missile units so you will just have to put more emphasis on that aspect.