I love stuff like Autolog (Need for Speed) and Ridernet (SSX). Asymmetric Multiplayer adds a ton of value to any game. Seeing how GTA V will be full of activities like races and stunts and actual 18-hole golf and god knows what else, I'd absolutely would love the extra incentive the inclusion of asymmetric multiplayer would add to these gameplay elements.
A good oldschool high score chase makes every game better. Even GTA V. Wouldn't you agree?