The Goodies:
Needs a good powerful PC but It really sets the standard for epic medieval battles.
The turn based layer is very similar to Civ IV but it is the real time layer gives you the goods.
I have played a lot of PC strategy games and this is by far the best. It really brings out the general in you as you try to control all of your troops especially when you hit an aggressive opponent.
The AI tactics are not as predictable as you would expect and it sometimes catches you out when you think you have the battle in the bag.
Beautiful cities.
Great atmosphere.

The Sheista:
Naval tactics can get annoying.
You can not save game mid battle so prepare to be engaged in real time battle for the duration.
missile units are not as effective as I would like.