this game is good because there is no rival
1 – real good car control specially when you turn the wheel in corners it must feel right and car must turn like a real car . Also, acceleration and braking and hand brake should be designed so realistic that you feel you driving with a real car .it should be something like need for speed undercover .
2- In terms of physical laws, such as weight and acceleration and speed and air pressure at different speeds on the cars the game must be designed realistic not fantasy . in some games the weight of the car is so low that when road have a little turn or bump control of the car is totally out of your hands , totally unrealistic .
3- graphics of the car and environment
4- sound of the car and engine and brake and environment must be realistic .
this terms almost considered 75% in this game and because there is no good f1 game lately i think it is best of its kind now .