He didn't even try to sound like Big Boss at all. Totally different intonation, tone and pacing. At least Robert Doyal managed to have these aspects right when he voiced Big Boss in MGS4. I'm not looking forward to having to listen to this lifeless voice work from Sutherland for all of MGS5.
The game is a short demo with some side missions. Think the tanker mission from MGS2 plus the extra missions from peace walker. it controls fine but the new hud makes sneaking a bit harder. it takes some practice to get used to marking guards with the binoculars before moving through the area. Losing the codex conversations removes some of the fun of watching the characters get to know each other.
Overall the technical presentation Fox engine is very good but some of the game design choices poorer then in previous MGS games. And Bosses voice is painful to listen to.