I've actually bought a few things without mentioning here, so I can give a quick rundown:
-Breath of the Wild: Obvious.
-Fast RMX: Like F-Zero (or Wipeout without weapons), but not as charming. Looks great, plays pretty well too.
-Graceful Explosion Machine: Nice little shooter with a four-weapon mechanic. Good for a short game every now and then, but it's no Ikaruga.
-Disgaea 5: Not currently available in Europe until the end of next month, but the Japanese version has full English text and voicework. Crazy Japanese SRPG which is a decent pick up and play game as campaign maps tend to be short.
-Puyo Puyo Tetris: Today's buy and a bit of a surprise hit; it's a really nice mix of two games; Tetris, and Puyo Puyo which never really made it big in the West. All sorts of modes to get your head around, including a thoroughly bizarre version which mixes both types of puzzle piece on one board. At £35 it may seem expensive, but it's really nicely put together, and if you like the two games, it's infinitely replayable. It's also, I've worked out, the only time I've ever actually paid money for Tetris, so there's some back karma there for me. There's a demo on the store.
-Mario Kart 8 Deluxe: The best version of Mario Kart there's ever been. It's mostly the same as the Wii U version with a real battle mode added in and a few new characters, but it's still absolutely superb and one of the best games of the last decade for me.
For the record, while the novelty has worn off this is still probably one of the nicest consoles I've owned. The system software certainly isn't what I'd call feature complete yet, but the UI is snappy and responsive and the USP is absolutely worth it.