GTA with a cop. Not just any cop though, because we have Crackdown for that, one of the most over rated games ever. I'd like to see it be an open ended game, with open ended missions where you play a cop. You have missions you need to complete and guys to arrest(however you see fit), but you can also go off and do your own thing. You can chose to enter partnerships with a gang to get a percentage of their drug profits, and in turn you put a stomp on an opposing gang. In doing so, you guarantee only one gang operating, no gang wars and drugs not going to children. So you could be a cop who does care to uphold the law, but ventures into that gray area every now and then to uphold it. You could coerce suspects, use excessive force. I think if they incorporated a light/dark side system a la Fable and KoTOR mixed with the GTA elements it'd be a great game. Perhaps if you use force on a suspect, he rolls over on someone else, whereas if you didn't he may lie to buy him some time or take all the heat, causing the trail to go cold, thus your mission to bring down a head guy takes longer as you have to do it by the book. Maybe to make it worth doing by the book though, the game could have a different outcome...Perhaps promotions. If you get caught doing some corrupt business you get charged yourself. Think of the main character being a Vic Mackey of sorts. I don't know. It all sounds pretty ambitious and I'm just thinking of stuff off the top of my head. I know they already have a game of the Shield but it's apparently pretty crappy and doesn't sound very open ended.