I think it's been quite some time since we've had one of these threads. (I just gave some leeway in the number of games.)

Something like this for me:
1. Spy Fox Bundle
2. Freddi Fish Bundle
3. Doom 3 + RoE original
4. Remorse: The List
5. Serious Sam 2
6. Dead Island 1

(I went ahead and "Bundle"d the top two since the games are so short anyway, and other people have put "series" down; but it does feel like kind of a bad precedent :P)

EDIT:
There have been some changes since my first post, so going to do some edits. Replacements in bold.

In no particular order

1. Z.A.R. + Mission Pack
2. Serious Sam 3: BFE + Jewel of the Nile
3. Doom 3 + Resurrection of Evil - Heavy Metal F.A.K.K. 2 (already played it as abandonware, but a great game, which I would gladly buy)
4. Command & Conquer games. All of them up to and including Red Alert 3: Uprising and the Remaster of the first two. Easiest would probably be to get the Ultimate Collection + the Remaster here.

5. Borderlands series (including all DLCs).
6. MadSpace
7. Missing addon levels for Tomb Raiders 1-3 - Gruntz (I have it on CD, but no idea why this game seems completely forgotten about)
8. Worms 3D (the original).
9. Unreal Tournament 2003 - All Unreal games (Epic being Epic)
10. Medal of Honor: Airborne

1. Original Age of Empires 1

2. Original Command & Conquer 1

3. Original Metro 2033

4. Original Metro: Last Light

5. Original The Elder Scrolls V: Skyrim

6. Half-Life 1

7. Battlefield 1942

8. The Marathon video games by Bungie

9. Original Age of Empires II

10. Unreal Tournament 2003

I agree with everything on this list, especially Age of Empires II and Battlefield 1942. I'd also like to see the Uncharted pc port that Steam now has.

1. No One Lives Forever
2. Stunt GP
3. Valkyria Chronicles
4. Iron Lung
5. Alpha Protocol
6. Driver
7. Postal Redux

Some games I'd gladly see here:

1. Millennium Racer
2. House of the Dying Sun
3. Command & Conquer series, but mostly Tiberium
4. Total War series - both Shoguns, both Medievals and Empire
5. Dust / Pył
7. American's McGee both Alice games
10. Warcraft 3 and frozen Throne, but that old version. Reforged can stay where it belongs: in a burning dumpster.

You have good taste in games my friend.

Cities Skylines
Dragon Quest Builders
Dragon Quest Builders 2
Command & Conquer Remaster (+whole collection)
The Sims Medieval
Railroad Tycoon 1 (as a freebie, since 2K made it a freebie at some point)
The Daedalus Encounter
Rollercoaster Tycoon 3 (a return to GOG)
Octopath Traveler
Rise of Nations: Rise of Legends [specifically the fantasy version]

1) Underworld Ascendant
2) Detention
3) Scarface: The World Is Yours
4) Mini Ninjas
5) Lost in Vivo (it's totally going to release here in a couple of hours, right guise?!?)
6) White Day: A Labyrinth Named School
7) One Finger Death Punch
8) Trespasser
9) Rogue Warrior
10) Devotion

Couldn't fit Hunter Hunted into that Top 10 list, I'm afraid. Chances are, I'd still buy it.

Also looking forward to that alleged gog build of Quake Enhanced Edition that was being finalised in August last year finally getting a release here (more so if it has working multiplayer - it ain't gonna happen, but hey, you can still dream)! Would also love to finally see Doom 3 & Expansion here!

If dreaming, any would be fine to me:

OLD
ChessMaster 9000, 10th Ed or Grandmaster Ed
Killer Instinct
GTA 3, VC, SA, LC
Warcraft 3 ROC + TFT
The Lord of the Rings: The Return of the King
NBA 2k11, Live 06
FIFA 11
Enter the Matrix
Guitar Hero III
The X-Files

PORTS
Contra III: The Alien Wars
NFL Fever
Mortal Kombat Ultimate
Donkey Kong Country 1, 2, 3
Turtles IV: Turtles in Time
God of War 3
The Warriors
Lord of Rings The Two Towers

RECENT (No hurry, I can wait)
God of War
Teenage Mutant Ninja Turtles: Shredder's Revenge
Tony Hawk's Pro Skater

COMMING SOON (No hurry, I can wait)
The Lord of the Rings: Gollum
Mictlan: An Ancient Mythical Tale
Valfaris: Mecha Therion
Gotham Knights
Teenage Mutant Ninja Turtles: The Cowabunga Collection
Marvel’s Spider-Man Remastered
I Am Jesus Christ

Elden Ring
Spiderman Remastered
Red Dead Redemption 2
Xenoblade Chronicles 1-3
Persona 5 Royal
Hades
God of War 2008
Donkey Kong Country Tropical Freeze

I would probably say, in increasing likelihood of showing up here:
* The various SaGa remasters, maybe some other Square Enix remasters while we're at it
* Phantasie series, Magic Candle, and other RPGs of that vintage (or older!)
* Bloodstained Classic Mode 2

(The last one is going to be paid DLC for Bloodstained: Ritual of the Night. Since the game and its currently existing paid DLC are already available here, it seems reasonable to expect future paid DLC to also show up here.)

I read that a co-op mode is supposed to be added in like version 1.5 of Bloodstained. That sounds interesting.

Co-op doesn't really interest me because I don't play multiplayer. On the other hand, Classic Mode 2 does since I've been wanting a game like Castlevania 2: Simon's Quest for quite a while. (Is there a game like that on GOG? The Castlevania/Contra collection doesn't count.)