A TOP 5 seems very unfair to the system's absolutely stellar catalogue, specially as far as my personal prefferences is concearned. I can't do anything less than a TOP 10 and even I feel bad for some of the games I have to leave out.

1. The Legend of Zelda: Breath of the Wild
2. Hollow Knight
3. NEO: The World Ends With You
4. Metroid Dread
5. Dragon Quest XI: S
6. Xenoblade Chronicles 2 (Feat Torna)
7. Astral Chain
8. Taiko no Tatsujin: Drum n' Fun
9. Pokémon Legends Arceus
10. DOOM (2016)

Top 5 Switch games:
1. Breath of the Wild
2. Metroid Dread
3. Xenoblade Chronicles 2
4. Fire Emblem Three Houses
5. Super Smash Bros: Ultimate

If I could include a sixth then Pokemon Legends: Arceus and Monster Hunter Rise would've tied

Same here and also had Odyssey :D

I think I've done that with 2-3 different systems (getting games for it before the actual console).

I got my Switch one year and one week after launch, so year 2.

My top 5 Switch games:

1. The Legend of Zelda: Breath of the Wild
2. Astral Chain
3. Ys VIII: Lacrimosa of Dana
4. Metroid Dread
5. Ori and the Will of the Wisps

If I counted games that are part of a collection then Super Mario Sunshine would've been at #3.

I have more games on my Switch than on any other console I own and a big part of my favorite games are on the Switch. It's versatility completely changed my playing habits.
It's amazing, it's detractors (joy-con drift mainly) never could take away from how much I love this console for it's innovation and it's games.

Going to exclude WiiU ports...

1) Links Awakening.
2) Metroid Dread.
3) Paper Mario.
4) Astral Chain.
5) Mario Oddysey.

I won't separate indie from AAA since indie titles easily deserve a place among the regular Top 10

1. The Legend of Zelda: Breath of the Wild
2. Hades
3. Hollow Knight
4. Super Mario Odyssey
5. Super Mario 3D World + Bowser's Fury
6. Celeste
7. Metroid Dread
8. Super Smash Bros. Ultimate
9. Octopath Traveler
10. Link's Awakening

1. Breath of the Wild
2. Splatoon 2
3. Fire Emblem Three Houses
4. Dragon Quest XI
5.Super Mario 3D World + Bowser's Fury

I have a feeling my list will change substantially after this year.

1. Celeste
2. Dead Cells
3. Mario Odyssey
4. Smash Bros. Ultimate
5. SteamWorld Dig
6. Metroid Dread
7. Link's Awakening
8. Overcooked
9. Hades
10. Mario 35

1. Bread
2. Fire Emblem TH
3. DOOM Eternal
4. Ys VIII
5. DOOM 2016

We've had the Switch since 2019. In that time I've played a total of three games on the system, so a top 5 isn't happening, but here are those three games in order I guess.

1. Breath of the Wild
2. Super Mario Odyssey
3. Luigi's Mansion 3

I do have Fire Emblem: Three Houses waiting on the shelf, but not sure when I'll get around to it.