From your comment I can see your scripting is not what we usually call scripting.How is that even theoretically possible?
For us, generally, scripting is the coding embeded into the game that makes the AI behave in ways impossible to counter, and that always happen after specific events. For example, and referring to PES2015, it is very usual (thankfully I dont suffer from this) to "conceed" a goal just after you score. Or to perform a sliding tackle, win the ball, and the AI player throws you to the ground when you start running without opposition.
From what you say I think you were referring to animations/player movements. This saw a major improvement i this new games mostly due to the new graphics engine used. I love PES2013, but it was mechanical and not fluid/realistic. After trying PES2015 I can't go back to the robot-like animations. It is that much better.