The scale of this game is amazing! If you have a pretty grunty PC with lots of memory and a good graphics card it's a brilliant game. It takes aaaaaaaages to conquer the work so don't expect to clock this game in a hurry. The detail on individual units is superb for the number that are in the game. It's not just about the battles either, if your into more of an economy/spy/diplomacy base strategy game this will be right up your alley. I have had it for quite a while now and still have a lot of game time left with this title.
You can adjust number of units in battle, detail and a number of other things which make the game experience really amazing provided you have the hardware.