In Days of Thunder you don't have a Jimmy, Tony or Junior's, but you do have Cole Trickle (Cruise's character in the movie) and a whole host of drivers with names that sound like good ol' boys. And you've got good looking cars that make it look exactly like you've got a real Nascar game.
You're job is to keep racing and keep trying to win, because, has Ricky Bobby would say, "Second Place is just the first loser". Along the way you'll unlock more tracks, a wide variety of achievements, and an even bigger list of cars. This makes the game as close to a must have for Nascar fans as it gets (for now).