It hasn't a good story for missions, lots of them have a same situation with a bit different in mission's target! ......
It's better to lay in skirmish mode or multiplayer, you'll enjoy more to play with your fiend than playing with boring missions!
On of the game's good option is a new camera mode that you can see your army thorough your troops. The graphic is pretty good and if you have a good graphic card that supports new features like pixel shader 2.0 and ... you'll enjoy it a lot ...