I said this in MAN OF STEEL...this "distance" is very much intentional. Lois is his lifeline, his mother, and to a smaller extent, Perry. And that does come through.
Cavill really does excel at exhuding warmth without even any dialogue. His greeting of Lois, the Day of the Dead sequence, the quiet smile when he saves that girl as he returns her to her family, and the moments at the end with Lois...just...perfect stuff.
And that. Is. Superman.
It'd just be nice to have a bit more of that.
But I get where they're coming from. He's still unsure of his place in the world, how to relate to those who see him as a God, etc. Even in the court he was having some issues.