The best Formula One simulation ever made
For a game released 4 years ago the presentation is also extremely detailed. This even goes to the extent of having to control the car in the pits, both exiting garages and parking in them. You also have all of the options and data available to you in the cockpit that a real Grand Prix driver would have, including real time traction control, brake balance and engine adjustments, all made in car. The replays are also tremendously in-depth giving you access to all sorts of cameras, including around 10 which are placed on the cars themselves.
All this said, Grand Prix 4 was built based on the 2001 season and the only way to really get the most out of the game today is to download one of the many modifications available online in order to bring the game up-to-date. The latest of these modifications will give you updates for the teams, drivers and circuits of the 2006 season. However, the modification process is not straight forward so its likely that you'll have to hunt around on specialist forums and websites (such as grandprixgames.org) to really grasp what it is you're supposed to be doing. As well as updating these aspects of the game you're probably going to want to look for graphical updates as well and these are more difficult to find (I'm still struggling myself).
Overall, if you put the time into modifying Grand Prix 4 and are willing to persevere with learning the complex realistic car handling you'll have yourself the most rewarding racing game imaginable.
NB: THE SCORES GIVEN IN EACH AREA RELATE TO PLAYING THE GAME WITH THE 2006 MODIFICATION INSTALLED.