Darth Id said:
You cannot have a protagonist that wears a stationary mask the whole time.
It would be UN-watchable.
Didn't they do that with the last Judge Dredd film? I didn't see it so I might be wrong.
Anyhow, I think it would work. Imagine a whole film where he hardly speaks and you learn about the character purely through his actions. Basically follow him on a really difficult mission - it would be great.