War gaming fun tools

[CosPetia]

Hi there,

Would you share your expectations on the war strategy game? What would be your most desirable functionality?

I would expect to see a great amount of re-playability, realistic war weapons, story, intuitive UI, nice strategic and tactical map, some story behind, various battle scenarios and challenging enough AI. Certainly to be impress to find good variety of military equipment at my disposal and ability to customize my units. How hard the game should be?
What you will expect to see in the game and what will definitely frustrate you?