Almost the same as GTA 4. Fix police, BETTER NPC's (best part of the game), better graphics, more realistic wanted system (such as 1 star is a ticket not an arrest), a SHIT ton more vehicles, more pedestrians on the streets, all buildings and rooms should be accessible, more weapons, huge map that takes 30-45 minutes driving just to get to the other side, speedometer in cars, better crashes, cars cant take as much damage, planes, trains, helicopter, every form of transportation in real life, bring back parachutes, able to have conversations with NPC's, let walking around the city not be as boring as it has been with stunning visuals, more alternate story routes. I would put more but i believe that is enough of getting my hopes up.