I don't think it is exclusive, but triangle strategy was superb in every way.

Based on the criteria, I'd have to go with Super Mario Odyssey. Just such an imaginative game that ran beautifully and felt like what I wanted the design of SM64 to become (instead of what we got with Sunshine). The creativity of the transformation mechanic is impressive and the game is fun the whole time.

Dread would be second, but Odyssey definitely wins this for me.

Super Mario Odyssey for making me smile and giving me so many things I wanted in a Mario game. It's the best Mario game.

Super Smash Bros. Ultimate and Animal Crossing: New Horizons are close.

I love the sheer variety of opinions in here.

Metroid Dread takes the cake for me. It was my first playthrough of a Metroid game and I enjoyed it thoroughly. Such a fantastic game; pristine animation, challenging boss fights, stunning visuals - but above anything else, the level design which is GENIUS. The way Dread makes you feel completely lost and confused but you always find the right way to go, what an achievement.

Sure we all die eventually. But no I'm not in a weak position about this question, I think it's plainly obvious if you're honest about it.

Mario Kart 8 is to 8 Deluxe what Smash U is to Ultimate, it's plain to see.

Yep. Clear and obvious.

A great game is a great game, does GoW Ragnarok being on the ps4 matter? How about Horizon? The Switch having Wii U games isn't a bad thing.

Of course. But Smash Ultimate is not just an enhanced version of Smash for Wii U. That's the point. 

It matters in that BOTW or Mario Kart 8 are not Switch exclusives, while games like Mario Odyssey and Metroid Dread are.

That doesn't mean BOTW and MK8 aren't great games, but it does mean they're not eligible for the position of "best first party exclusive."

Then the ps5 has a really weak lineup because most titles are on the ps4 as well.