When the Mazda Miata debuted in 1990, it started a revolution. As any driving enthusiast will tell you, the Mazda Miata re-invented the concept of small, agile roadsters. Although significantly down on power compared to some other F-class cars, the Mazda Miata's extremely low weight and outstanding response to driver inputs makes it one of the easiest cars to take corners with in Forza 3. It makes the front wheel drive cars given to the player after the tutorial feel like big, heavy pigs, and you'll likely need to re-calibrate your sense of what is possible in a hairpin turn.
The Mazda Miata is rear wheel drive, and it can get out of hand when pushed extremely hard. But that is also a strong point. The Miata is a superb car for learning how rear wheel drive vehicles handle in Forza Motorsports 3, and it is far more forgiving to sloppy driving than, say, a Porsche or even a Mustang.