My plan was to pick up Doom, or Skyrim, as the next game after Mario Odyssey. Instead, I downloaded Rocket League ($20, as opposed to $60 for the aforementioned games).
The best way to sum up the game? It's soccer with RC cars. It has a learning curve, but it is very addictive!
On a side note, I'm becoming more and more impressed with the variety of titles on Switch. Yes, it is getting a lot of steam/PS3/PS4 ports, but the ports that it is getting are good, and it is getting just as many exclusives as the competition. For me, the handheld aspect seals it!