My personal favourite is England... Their archers may be outclassed by later longbowmen, and they may not have a counter to cavalry or the best cavalry in the game, but the AI is dumb as a pile of dog poo, so it doesn't matter, you'll still win everytime.

As for them not havign any good infantry as someone above said... I count 5 different types of very good English infantry, so where you get "1" from i do not know.