What Mario Kart did successfully was to create an arcade racers with a multiplayer "rubberband" effect. That is, a superfical method of keeping the race closer between players of different driving skills. Arcade racers relies more on "rubberband" AI more than sims. With sims racing the players will be more spread out on the track relative to their driving skills. So having 16 players multiplayer is more important for a sim like GT5 while an arcade racers like MK, 4 players are plenty. 4 players on GT5 would only be interesting if all the players was equal in skill.







