Plot just provides us with a win condition, it is not necessary for the act of play. I can enjoy a game without plot, but I can’t enjoy a game without world building because that is a game without rules.
Developers of games like Heavy Rain, Mass Effect, and Fallout 3 take pride in their ability to provide players with the experience of deciding for themselves exactly how plot lines will develop in their games. So why are we gamers fixated on the idea of making and playing such games?
Maybe David Cage of Quantic Dreams had the right idea when he suggested people play through Heavy Rain one time only. After all, you can’t recognize the inconsistency of branching plots if you only see one of them.