Modding is a great way to make a game more interesting and playable, especially when it comes to sticking bits of unrelated games together. GTA V and Goat Simulator are about as unrelated as you can get.
If you thought the second Black Ops game took some technical liberties, hoo boy. This one is going full-blown science-fiction. Note that the game doesn't just star the vocal talents of Kevin Spacey; the guy is literally in the game