I went on Mario Kart twice around park close last weekend, once in single rider and once in standby. Gotta be honest... I absolutely love this ride. It fills you with a big nostalgic rush and made me feel like I was 8 years old playing the game. The sets look amazing and distinct even with AR goggles. I knew I wouldn't fully understand the gameplay on my first ride, but similar to Villain Con, re-riding it helps significantly.
As for the land itself, it's similarly awe inspiring and wondrous. I didn't spend much time in the land because I wanted to go on other rides while I had a few hours in the park, but the interactive games and elements I experienced were all fun.