Mario Kart is pretty neat, but IMO not good enough to be the sole nintendo game available at launch.
The fact that the open world stuff isn't a forza horizon clone just feels like a missed opportunity, they could have made a game that would last for the entire generation if they just had copied someone else's homework instead of being stubborn and doing a nintendo.
I wish I had picked up a pro controller as they are now out of stock everywhere, as the joycons are still not that comfortable.