I just picked this game up the other day and its an amazing RTS. The game has abandoned a lot of the traditional RTS elements such as resources and buildings and instead is based almost entirely on tactics, the troop strengths and weaknesses are really pronounced which means you actually have to bother about things like a rearguard otherwise you get flanked and lose all your archers and cavalry, you also simply have to use scouts otherwise you get ambushed and similarly destroyed.
I haven't had this much fun playing a RTS since Rome:Total War and it really does make you think differently than the traditional RTS as there is much more emphasis on where you put your troops in a battle than on how many troops you actually have.
So yeah, anyone else played this game? And what other games have a similar sort of emphasis on tactics? I might have to try and find some more =P