Pretty good
I liked it and all, but you should try to customize what the grunts say. In the game, they have like 5000 different action phrases, like "Grenade" and "I'm thirsty. I can't wait to get back to the hold and to my feeding trough"(This is accessible only in a certain level. See a guide or something for details on how to find the talking grunt)
Overall, not bad.