I just got it today. It has lived up to my expectations thus far. I beat a short campaign as the French, and that helped me figure out the main campaign mode. Battles are still difficult for me since I'm not familiar with any of the units yet.

There are a ton of different units and there are a ton of different factions to choose from. It's hard for me to learn them all or decided on a favorite. So far, I'm beginning to really like the Moors.
They have some awesome light cavalry, and I believe they are the only faction to get mounted musketeers.

Anyone else have this game yet? What are your thoughts?

I want to get it but the demo didn't run at all so I don't know whether it will run on my computer

It does look great though.