I am only going to rank the exclusives I have played to narrow the list a bit...
1. Zelda BotW (it released day and date with WiiU so I am counting it)
2. Xenoblade Chronicles 2
3. Octopath Traveler
4. Mario Odyssey
5. Smash
6. Splatoon 2
7. Super Mario Party
8. ARMs
9. Kirby Star Allies
Let it be known that the only game I was truly disappointed with was Kirby. I enjoyed it, but it was short lived and far too easy for the price.