If the fans are happy then they are happy, they dont base success of their job on similarity to the video game.

If you want examples of actors who cared we have both the Halo and Witcher series. While its noble that both leads did everything they could to prevent the show runners from dragging both shows into the ground, neither were successful.

Perhaps if the Fallout series was poorly received, they would consider playing the games so they could attempt to help fix the show.