I'm partway through the second mission, and I've been fighting multiple enemies by blocking, waiting for one of the enemies to start to move, and then counter-killing. Rinse and repeat. This is slow, but pretty foolproof.
Is there a faster technique when dealing with several enemies? Also, are different tactics going to be required further down the road? I think The combat will get pretty boring if this is all I have to do for the rest of the missions.