Thank you! Half of them played by me and fully agree in these cases. For the rest - well, I guess it's time to finally play them.

I dunno, maybe around 20 or 30 if you count games that are on gog but I might have played elsewhere.

Divine Divinity
Blood
Duke 3d
Crystal Caves
Secret Agent
Realms of Chaos
Fallout
Fallout New Vegas
Broken Sword
Sam and Max Hit the Road
Telltale Sam and Max season 1
Full Throttle
Day of the Tentacle
Broken Age
Monkey Island
VVVVVV
Braid
Owlboy
Doom
Wonder Boy Dragon's Trap
Umineko Questions arc
Higurashi episode 1
One Step From Eden
Gobliiins
Blocks that Matter
Steamworld Dig
Slay the Spire
Rayman
Rayman 2
Rayman Origins
Psychonauts
Little Inferno
World of Goo
Human Resources Machine
Jill of the Jungle
Hotline Miami
Hatoful Boyfriend
Gurumin
Ys 1+2 chronicles
Ys origin
Ys oath in felghana
Ys Ark of Napishtim
Ys Celceta
Ys Seven
Escape Goat
Dragon Age Origins
Deus Ex Human Revolution
Cosmic Star Heroine
Costume Quest
Bioshock
Bioshock 2
Bioshock Infinite
Bastion
Trails in the Sky
Jade Empire
Moonlighter
Gato Roboto

huh. about 50, so more than I thought (probably leaving some out too)

Assuming we're talking story games rather than strategy games and counting some I didn't buy here but are in the GoG store, not all that many really. I find a lot of RPG's I get tired of the repetitive combat and quit in the middle of the game. And I there's a lot of games that I quit when I got stuck (Deus Ex: Human Revolution and Baldur's Gate come to mind). Life is too short to play a game when it becomes frustrating rather than fun.

Deus Ex 2: Invisible War
Dishonored
Dishonored 2
Dragon Age: Origins
Dreamfall Chapters
Dreamfall The Longest Journey
Fallout
Fallout: New Vegas
Grim Fandango
Might & Magic VI
Might & Magic VII
Planescape: Torment
Sanitarium
Thief
Thief 3: Deadly Shadows

There are a fair number of games that I really liked that I didn't finish: Fallout 2, Thief 2, Baldur's Gate 2.

-removed-

46 games, 2 of which I intend to play because they offer an alternate campaign with significant enough differences that I won't find it repetitive. (Although my account dates to 2013, I've only been seriously collecting/playing games here in the last two years)

I tend to like games with a well defined end/sense of completion, so open-ended strategy games are conspicuously absent from my list of completed (or even played) games.