This project is abandoned.
I'm aware. But the point still stands that someone, even as seemingly inexperienced as that developer, can create a solid S4 base. Of course I'm ignoring all of the other stuff that game needs like game mode logic, weapon logic, client->server communication, etc.... but as I said, that stuff really isn't hard to do for an experienced developer.
EDIT: I know you were just pointing out it's abandoned. Just wanted to clear up anything else.