For 3 reasons: The specials, which gives characters a reason to be chosen, the music (which is the best among all Mario Kart versions) and the great tracks design. It also had the best multiplayer features for battles, multiplayer was a blast on MKDD. I didn't feel like it was that great on Mario Kart Wii, the battle courses were just plain confusing and too big. Also, the physics were really awesome, way better than in Mario Kart Wii or 7.







