This game is a fresh revision to the world of RTS which has been flooded by the Command and Conquer series which hasn't given us anything new. And lets be honest, Starcraft 2 is the same gameplay it was 10 years ago.
In this game, you get abilities called RUSE, which are abilities you activate such as a spy in an area who will report any enemies he sees in the area. There is the decoy army, which you can say to send a fake air force to fly at the enemy and they will shoot at them. Combine this with your real army, and the enemy wont know the fake units from the real units, thus increasing the survivability of the real units.
Another great aspect of this game is the amount of nations you can be, and how they are all very different from each other. Britain has a good amount of air power, Germany has some of the best anti tank capabilities, the French have some of the best defense structures, and so forth and so forth.
The game doesn't have as much micro managing as other RTSes, but it requires a lot more strategy. It adds a sense of realism in how you would command a military as opposed to just doing rush tactics, which don't work by the way. People who like this are the people who like games like Company of Heroes, and Iron Hearts 3.