I'm also very fond on guns! In a 16 unit army I usually have 4 gun units. Some would find this excessive but I'm very fond of tactics that involve some form of hiding in the mountains. Guns are great for defending, while Heavy Cav. try and charge up a mountain in the bitter winter.
On a slightly different note, during the Campaign game it is often hard to get guns. The Dutch arrive late and the switch to Christianity is not worth it. Therefor when I play the campaign I outfit my armies with 3 or so Samurai Archers.
-Shiro