Question: How does this game compare to Fallout?
Answer: The same way apples compare to oranges.
Also, stop calling this a role-playing-game. It's an open world first-person-shooter with a light upgrade system which you could basically skip completely after the tutorial if you really hated it and weren't concerned with the associated achievements. Continuing to say this just gives people looking for information about the game a false sense of what the game is really like.