I'm absolutely not a fan of the way Epic has been dealing with things but in the end it's about playing the games for me. If they somehow picked up an absolute must-have day 1 title, I'd probably get and play it, just nothing else. Heck, I'm considering Stadia for OMD3 (really... REALLY don't want to so it'd have to be freaking good and certainly not over 30-40)

You do realise rocket league was on steam first.
Gamers could also complain about Kerbal for its spyware antics or Night in the Woods over the people involved in making it.

Stellaris
Pillars of Eternity
Divinity: Original Sin
Book of Demons
Fell Seal: Arbiter's Mark,

Update on the list including new votes, a person I missed and a name correction.

Some 'rules' I'm following:
-Please no 'multiple games'. Example Metro 2033 & Last Light Redux. Saint's Row SERIES. By all means... choose all of them in your list... but don't list it as ONE entry. I'm going to count each game and knock off your later entry(s)!
-Please no games that come to another platform or country recently. Quake 1 came to GOG in the last 5 years. It was released in 1996. I'm not counting it. No one did that with Quake... just giving an example.
-If you change your mind and want it listed please post a note about it. I'm not going to notice an edit.
-DLCs will be counted as the base game. Exception: Stand alone expansion. Prime example is Wolfenstein Old Blood. It was developed originally as an expansion, but released wisely as a stand-alone product.
-If you see your name listed but not a game you voted for: It wasn't released post 1-1-2014 or one of the above issues. If you disagree because of a massive update or enhanced release let me know.
-If you disagree or want to rearrange/create/update this list you are MORE than welcome to copy/paste it and update it.

Looks like we've got a clear lead with The Witcher 3...

9 - The Witcher 3: Wild Hunt

4 - Night in the Woods

3 - Assassin's Creed Odyssey
3 - Divinity: Original Sin 2
3 - God of War
3 - Grim Dawn
3 - Shadowrun: Dragonfall Director's Cut

2 - Bloodstained
2 - Book of Demons
2 - Darkwood
2 - Dishonored 2
2 - Divinity: Original Sin
2 - Doom
2 - Grand Theft Auto V
2 - Ion Fury
2 - Life is Strange
2 - Monster Hunter World
2 - Nier Automata
2 - Prey
2 - Thimbleweed Park

1 - Age of Decadence
1 - Alien Isolation (Good choice, I may update my list...)
1 - Among the Sleep
1 - Baba is You
1 - Bardbarian
1 - Batman: Arkham Knight
1 - BioShock Infinite
1 - Bloodborne
1 - Darkest Dungeon
1 - Dark Souls 3
1 - Detention
1 - Dragon's Dogma: Dark Arisen
1 - Deus Ex: Mankind Divided
1 - Dex
1 - Diluvion
1 - Don't Starve: Reign of Giants
1 - Downfall
1 - Dying Light: The Following - Enhanced Edition
1 - Ember
1 - The Evil Within
1 - Factorio
1 - Fallout Shelter
1 - Fell Seal: Arbiter's Mark
1 - Firewatch
1 - Forza Horizon 4
1 - Gemcraft: Chasing Shadows
1 - Ghost of a Tale
1 - Glass Masquerade 1
1 - Grandia II Anniversary Edition
1 - Hellblade: Sensua's Sacrifice
1 - Her Story
1 - Hitman 2016
1 - Hitman 2
1 - HuniePop
1 - Jotun
1 - Kenshi
1 - Kerbal Space Program
1 - Kingdom: New Lands
1 - Kingdom Rush
1 - The Last of Us Remastered
1 - Legend of Grimrock 2
1 - Metro 2033 Redux
1 - Metro Last Light Redux
1 - Metroid: Another Metroid 2 Remake
1 - Mount & Blade: Viking Conquest
1 - The Müll Littoral
1 - No Man's Sky
1 - One Finger Death Punch
1 - Pathfinder Kingmaker
1 - Pathologic 2
1 - Pillars of Eternity
1 - Pokemon Reborn ep. 16
1 - Prison Architect
1 - Regions of Ruin
1 - Return of the Obra Dinn
1 - Resident Evil: HD Remaster
1 - Shadowrun Returns
1 - Slay the Spire
1 - Sleeping Dogs Remastered
1 - SOMA
1 - Spiderman PS4
1 - StarCraft II: Legacy of the Void
1 - Stasis
1 - Stellaris
1 - Streets of Rage Remake V5.1
1 - Subnautica
1 - Superhot
1 - Tales of Maj'Eyal + DLCs
1 - Tangledeep
1 - Terraria v1.3
1 - Tomb Raider: Rise of
1 - Tomb Raider: Shadow of
1 - Train Valley
1 - Two Point Hospital
1 - Underrail
1 - Valkyria Chronicles
1 - Westerado: Double Barreled
1 - The Witness
1 - The Wolf Among Us
1 - Wolfenstein: The New Order
1 - Wolfenstein: The Old Blood
1 - World of Warcraft - Classic
1 - XCOM 2
1 - Xenonauts
1 - Yakuza 0

Voters so far...
Cadaver747, CMOt70, KiNgBrAdLeY7, StingingVelvet, GreasyDogMeat, Leroux, Cavalary, Plokite_Wolf, real.geizterfahr, paladin181, Tallima, krugos2, teceem, koima57, kai2, Pheace, entroumi, Anothername, toxicTom, BeatriceElysia, morolf, Dray2k, MadyNora, fronzelneekburm, Mr.Mumbles, Matewis, Lifthrasil, PaterAlf, DampSquib & olorton

Napoleon: Total War
Age of Wonders III
Endless Legend
Port Royale 3
Talisman: Digital Edition

These are not games released within the last 5 years. I almost never buy/play newly released games.

Sorry I couldn't be bothered with checking the release date of the games. Is there any quick way to list games owned, time played and release date?

Witcher 3
Assassins Creed: Odyssey
Divinity: Original Sin 2

I agree with you as it clicked for me for Miami after spending hours trying to complete every challenge and escalation (the recent one with a shotgun was quite cool!), i hope i'll get that motivation for Mumbai someday again.... :)

I won't spoil it unless you ask, but there's simple tricks in Mumbai to get the targets out of their strongholds. That really helps with playing the level repeatedly, because if you don't want to mess around getting to one or the other you can quickly dispatch them.

As much as i dislike always online, this game do'nt stop giving, and is deep with tricks... I usually try what i can first then watch online for hints and guides, MrFreeze on Youtube is quite alright for Hitman 2 SASO feats.

Hollow Knight.

There are probably others, but I didn't feel the same level of enjoyment and drive to complete as I did with that game, so it seems odd to include those as well.

Last 5 years...

Rebel Galaxy
Neir Automata
Final Fantasy 13-2 & 13-3
Skyrim
ExaPunks

Um, I've only played two games released in the last five years.
My favourite is definitely Shadowrun: Dragonfall [Director's Cut]. The sequel is terrible, but the UGC is much better (some almost as good as Dragonfall).

I have played a little of Dex and it's not terrible, but I couldn't play it on my old laptop and it's not compelling me to play it now, so I'll stick to the other games I'm playing.

But, according to a strict interpretation of the OP question, both games get a vote. :/