I try to avoid the word "perfect" when I'm writing in general terms. If I drop the p-bomb, it's usually meant to describe components that could not possibly be improved upon. Split/Second boasts a near-perfect visual presentation. The environments are stunning, the Power Plays are fun to watch, and the cars look sleek. Every time an opponent's Power Play threatens to rip the chassis off your vehicle, a number of great visual effects work together to provide a sense of danger. The screen shakes, debris showers everywhere, you get a case of tunnel vision, and a neat special effect gives the color palette an awesome, washed-out appearance. Split/Second makes use of its head-up display in a way that is clean and cool. All the data you need to know is superimposed on the rear of your car. Split/Second is not the most attractive racing game (in my opinion, that honor currently goes to DiRT 2), but it's certainly up there.
Split/Second doesn't really leave much to be desired in the way of sound design. Cars sound mean and explosions sound costly. Several of the Level 2 Power Plays begin with that classic silent moment that normally serves as the go-to prelude for truly cataclysmic cinematic events. When the you-know-what finally hits the fan, it sounds like Hell on Earth. The game's soundtrack is decent and doesn't feel out of place in any way, but it's nothing to jump up and down about. You will learn to hate the music that accompanies the conclusion of an event in which you place second. I'll explain why later.