Playing GT4 is a Great Racing Game.
GT4 is, as it claims to be, "The Drive of Your Life." You can race in more than 650 cars, spanning a century of automotive history, on more than 100 photorealistic tracks from around the world. The physics are extremely realistic and the tests for your licenses are as challenging as ever. However, if you have old licenses saved from GT3, you can import those to get right into racing.
The races are nicely divided into different proficiency levels, and many are restricted to certain makes, eras, or drive type (FWD/RWD), allowing you to race similar vehicles. The rally tracks are much improved over GT3, with beautiful vistas and the nearly total lack of traction to be expected when taking gravel roads at high speed. (I lived in the country for quite some time, so I know of what I speak.)
There are a couple of new aspects to Gran Turismo 4 that weren't in previous Gran Turismo titles. First are the B-Spec level races – a bit more advanced than the A-Spec races, to offer more challenges for the more advanced player. Also, the new photographic elements allow you to take amazing images as if taking a snapshot, and then save and even print them out on a photo printer.
GT4 played with a normal controller is deserving of a very high score. It's just that good. However, playing GT4 combined with the Logitech Driving Force Pro Force Feedback Wheel raises the bar, taking the experience to a higher level. If you can throw in a VRC-1 Virtual Racing Chassis, you've got a genuine racing simulator on your hands. (Icing on the cake? Use a head-mounted video system such as the Olympus Eye-Treks for an even more immersive experience.) If you like racing, you won't want to leave the house again...