I agree with Dream and Sgt Pepper on this one.
It looks creative and interesting to try, but you will need to be fast talking and you need to manipulate really well and fast the I/O. The worst part is, in fast paced action runs you seriously need to speak fast and also move your hands well.
But it has pluses, for instance. If you label your factories (barracks or spirit lodges). You can build units on the fly whne you are attacking bases. A truly useful tool in battle.
Also, as Sgt Peppers stated, I wouldnt want to wake up my parents at 1 am saying commands over and over. If I was alone in the house in the afternoon, I would do it. Also, my audio conservations with people or friends would **** up the controls.
I would however stick to mousing it. It is the only way to truly play and command your warriors effectively.