@Carl:

The thing is, that while the scots' missile units make credible heavy infantry, they suck as missile troops. Which feeds into the Scots' basic problem: They are a one trick pony. They have probably the best heavy infantry lineup in the game. No one is debating that. But it doesn't matter. Heavy infantry alone cannot win you a war against a competent enemy. Mixed forces will beat you every time.

Without dedicated, long range, armor piercing missile troops, or credible cavalry forces, your heavy infantry are just expensive sitting ducks without support.