I’m thinking 2015 - Witcher 3, Undertale, and Kerbal Space Program are all classics. Fallout 4, Arkham Knight, and Cities Skylines were all excellent too, though fallout 4 and Arkham knight aren’t necessarily the best games in their respective series.
It’s probably not the most stacked but I think 2017 was still a monster year for games.
Breath of the Wild Mario Odyssey Persona 5 Nier Automata Hellblade Senua’s Sacrifice Divinity Original Sin II Doki Doki Literature Club Cuphead Prey Star Wars Battlefront II Destiny 2 Nintendo Switch itself
These were, for one reason or another, some of the most monumentally influential games in the last 10 years, no matter if you’re talking AAA, indie, platformer, shooter, open world, RPG, horror, you name it.