I've played two different demos of this (original demo, and PCgamer demo), and still dont see what the big deal is. Aside from the island itself, which is fucking amazing, whats so great about it?
The AI didnt seem terribly smart. I'd just make some noise, hide in a bush, and when the enemy comes over slash them up with my knife.
I suspect multi-player is pretty fun though, with everyone hiding in the foliage and crawling around.
- Fate