I agree. Mario Kart 8 is absolutely, hands-down one of the best games ever made. The controls are perfect, it has an insanely high replay value, the challenges are well-balanced, and it's absolutely gorgeous. They did a fantastic job.
The splitscreen is a vertical split, as opposed to a horizontal split, so both players become unable to accurately drift turns because you can't actually see where you are going. Half of your camera is your Kart and the other half is the sky. Rather than being able to see the road.
That's my own gripe with the game. Why offer splitscreen if the game becomes unplayable?
If it was split the other way it would be worse, vertical FOV is just as important as horizontal FOV on most of the tracks in MK8. I cannot imagine Rainbow Road with horizontal split, it would be terrible.