My updated list:

Mechwarrior series
Hexen II: Portal of Praevus
HALO series (incl. HALO Wars, Spartan Assault and Spartan Strike)
Condemned: Criminal Origins
Command & Conquer: Red Alert 3 + Uprising
Syndicate (2012)
Chameleon
You Are Empty
Space Hulk: Tactics
Vyruz: Destruction of the Untel Empire

My list (so far!);

Dragon Age II
Dragon Age Inquisition
Drakensang: The River of Time plus Phileasson's Secret DLC
Mass Effect Legendary Edition

Here's my 10 favorites I wish they were on GOG
(with links to Community Wishlist)

1. Silent Hill 2+3
2. Nocturne
3. Scratches: Director's Cut
4. Schizm II: Chameleon
5. Benoît Sokal's Paradise
6. The Neverhood
7. No One Lives Forever series
8. American McGee's Alice
9. Prince of Persia & Prince of Persia 2: The Shadow and the Flame
10. Heart of Darkness

Here are the Top 10 game series I'd like to see on GOG:

American McGee's Alice and Alice: Madness Returns
Dead Space 2
Doom (2016) and Doom Eternal
Fire Fight
Fury 3
Hades
Sandwarriors
Shellshock
Sim Tower
Wolfenstein (2009)

Civilization
Civilization 2 Multiplayer Gold Edition
Prince of Persia
Prince of Persia 2 - The Shadow & The Flame
Warcraft 3 + Frozen Throne
Age of Empires 2 Gold (with The Conquerors expansion)
Diablo 2 + the expansion (Throne of Bahl? something like that)
Sim Ant
Lemmings
Dune
Transarctica

(ok, that's twelve, I don't care, I want them all)

More EA or Ubisoft or 2K games. I want to see good olg Baattlefields or Medal of Honor , Command and Conquer games or Battlefront 2 (2017), Red dead redemption GtA games. Or strategy games like Age of Empires/Mythology, Battle for Middle Earth 1+2 , Kingdom Come 2, ,Assasins Creed games, or Tony Hawks Pro Skater 1+2, old classic FIFA, NHL...

The two Prototype games. I've played them. You would love them!
And Drakensang: The River of Time. I haven't played that.

Anna purnaa. ("Anna grumbles")

What does "3-10 games" mean? Is 3-10 a game publisher, or you shouldn't list your top two games to be released on GOG, only the top 3 to 10 games?

The new Kingmakers game seems interesting, I want it.

https://www.youtube.com/watch?v=5x2gY7CjDKs

Not sure why you skipped the TOP part

"Top 3 or top 10"

1. Civilization 1 and CivNet
2. No One Lives Forever 1+2
3. The Lord of the Rings: Battle for Middle Earth 1+2
4. Any iconic CRPG that is not yet on GOG (are there any?)
addendum: Amberstar

You are right, Diablo 2 would be a nice addition on GOG. I wouldn't call it a CRPG (as Baldurs Gate and the like) though

Define iconic? Does something being in the CRPG Book count? If so, plenty.

Sub Culture

This would be easier if it was a Top25 list, but here are the top10 picks (ordered by preference):

The Sims: Complete Collection
Black & White
Driver
Croc
Rapala Pro Fishing
Stupid Invaders
Nocturne
Gearhead Garage
Oni
Lucky Luke: On The Dalton's Trail