I'm more of an arcade racing fan rather than realistic simulators.
Crash Team Racing, Need for Speed, Midnight Club, Motorstorm, Modnation Racers, were some of my favorite racing games ever. I could never get into Driveclub, Forza Motorsport, or Gran Turismo. I never played much Mario Kart aside from having people over but I think its one of the few racing series that I would enjoy. With that said, the racing genre is one I fell off of hard, I haven't played a racing game thoroughly since Modnation Racers.