With E3 on the horizon, this list is bound to change very soon.
1. Super Smash Bros. (NSW)
2. Mega Man X Legacy Collection (NSW)
3. Mega Man 11 (NSW)
4. Metroid Prime 4 (NSW)
5. Steins;Gate Elite (NSW)
"Just for comparison Uncharted 4 was 20x bigger than Splatoon 2. This shows the huge difference between Sony's first-party games and Nintendo's first-party games."