To my understanding most of the storytelling is done by the writers at 343. What did those writers do to look so in depth what to do with the Chief in this game? They should’ve had interviews with real soldiers. They talk about what it’s like to be a guardian and so on, but how can you do that with just what you know. You can’t fulfill a true experience like that with motion capture or technology.
Actors aren’t everything. The fact that 343 seems to think that is some what frustrating.