that would be a lot funner than taking turns. imagine.
having the entire city to two of you (if its a two player multiplayer session). hunting each other. with the cops after both of you, people getting killed in the crossfire. ramming each other. shooting. helicopters. explosions. gangs after gangs. wow. it'd be fun just having a multiplayer with your friend
in the end there can be only one. and $10 says it'll be me, cause I have a bigger gun than you do so suck on that apple