Pokkén Tournament isn't quite as successful as some of the other Pokémon releases and other genre experiments (Pokémon Conquest comes to mind), but it offers high-energy battles and a unique framework for fights, even if it could use some tweaking. It's fun, and it has a battle ecosystem with real potential. Also, I do think its multiplayer could have legs in the esports scene.
Mario Tennis: Ultra Smash is fun. I enjoyed my time with it - much more so than I did with Mario Tennis Open. It's a step up over the last iteration in some areas, yet still it manages to be a lackluster entry in a series that seems to be sadly suffering from continual decline.
Kingdom has solid ideas that get lost in its own simplicity. It's a little too conceptual, and I found that it had a hard time holding my attention after a few in-game days. It has a whole kingdom out there to explore, but it just isn't varied or interesting enough to warrant the type of commitment it ask of the player.