I'd like to see Medieval2:Total Realism make the more elite units more rare. Even with the new recruitment system, it's not hard to get full stacks of Chivalric Knights, or other elite troops like Varangian Guards and the like, when you have a few buildings that boost their replenishment time.

1 unit of knights being trainable every 3-4 (or even more) turns will be way better in my opinion