From the review:
When you're racing, you'll also appreciate ToCA 3's excellent graphics and sound. Even on a mid-level computer like an iMac, the visuals are realistic, from the sunlight glinting off the cars to the dirt that gets kicked up if you stray off the track. The sound also makes you feel like you're in the middle of the action, especially the dirt that pings off the underside of the vehicle in the off-road races.
While the Rick-accompanied World Tour features a smorgasbord of racing types, Pro Career lets you stick with one of eight disciplines and work your way up the ladder, without his involvement. Unfortunately, if you want to race online against others, you're limited to the Mac-only service GameRanger. While GameRanger offers a good experience, it's always better to play against Windows gamers too, if possible; that way you have a much wider variety of competition.