Witcher III: Not yet played it, but I'd question it's place on this simply because a lot of it builds on the second game. Unless this is like a "Return of the The King stands for the whole trilogy at the Oscars" sort of deal.
Baldur’s Gate 2: Never played it.
Minecraft: Yeah, this deserves a spot, it helped launch an entire genre of games and influenced the design of dozens more, and ten years+ later it still holds up.
Diablo II: Never played it.
Half-Life 2: A glorified physics demo that functionally failed to integrate the phsyics into the rest of the game, leading to long sequences of the game where everything grinds to a halt while you solve puzzles, wrapped up with uninteresting and dated shooting. Dark Messiah at least did the physics stuff better.
Counter-Strike: Eh, it's....fine, I guess. I'm not sure CS specifically had much impact vs being one of dozens of other competative FPS games. I guess it's big for Esports, but that's an insanely niche thing.
Elder Scrolls V: Eh........It's fun, yes, but a massive part of it's staying power is the mod community that's built up around the game, the game on it's own loses a lot.
Civilization: Never played it.
Portal 2: Doesn't deserve a spot on this. Portal 2 was a decent seller, but it left no legacy or mark on the market aside from memes, and lots of games have done that and done that better.
Fallout: New Vegas:
I've complained about NV before, at some length, and I stand by my opinion. If any game belongs on this list, it's 3, for reinventing the series into 3D and turning it into a major franchise.
Doom Eternal: Doom Eternal is just a worse version of Doom 2016.
World of Warcraft: Never played it.
Quake: On a technical level, yes, quake is a huge deal, perhaps the hugest deal since Doom. As a game though....I have doubts, quake was rather limited in terms of narrative and design.
The Sims: Maybe. It was a fine game, though a bit niche.
Starcraft II: Haha, no. Starcraft 1 is one of the two or three titles that could make a claim to be the best RTS of all time, along with the likes of C&C and Dawn of War. Starcraft II is most notable for blizzard's "strike while the iron is ice cold" release strategy, dubious plot, and highlight blizzard's growing desire to become an animation studio over a game studio.
Team Fortress 2: Eh....again I'm iffy on this. It was very fun in it's day, and still has a stable community now, a decade and a half later, which not a lot of games can say. But that's only in part because of it's design, the other part is because it's free, and I have a hard time tracing any significant influence the game has had, if anything it's badly out of date and misdesigned (as anyone who's ever experienced the attritional slog that a public 2Fort match will inevitable degenerate into).