Finding food will be a bitch, kind of a touch and go thing. (Which is why we switched to agriculture) Bears will try to maul you, weather will ruin your day, and disease will be a constant companion. Assuming you survive all that and maintain a positive attitude, you'll be all set.
Those are our base needs. The system meets them. That's all its required to do, it doesn't supply enjoyment or things like that, those are your responsibility.