It's kiiind of like an RTS, but there's no base building or resource management, reinforcements is about as close as it gets to that.
It's key points are
direct control of any unit (much better than the recent CoH effort which I suspect was tacked on in response to FoW/MoW)
Very realistic armour penetration model based on thickness, round velocity, slope angle etc.
You can loot all dead bodies and vehicles for supplies, repair knocked out tanks and use them yourself
You can blow the living **** out of absolutely everything and because of the detailed physics some quite hilarious deaths can occur. My favourites include firing an armour piercing round that deflected off a tank and into a line of six infantry killing them all, and shooting through a building to kill a panzer hiding on the other side.
Also, driveable tractors and hilariously bad voice acting.
Demo on steam now