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Crash team racing
The soon to be released remaster of the original Crash trilogy
Smash bros Brawl
7th saga
Secret of mana
Chrono trigger
The original Spyro trilogy.

God Hand, spartan, shadow colossus, God of War, what a memory, when PS2 still The best console out there,
Persona 5
Edit : i'm also wish there is Suikoden series on steam :|

Breath of fire 3 and 4
Fatal Frame 1, 2 and 3
Shadowhearts 1 and 2
Need for speed underground 1 and 2

• American McGee's Alice
• Armies of Exigo
• Discworld 1 & 2
• Discworld Noir
• Dune and Dune 2
• Planescape - Torment
• Simon the Sorcerer (all games, or at least 1&2)
• The Legend of Kyrandia (all games, or at least 1&2)
• The Lord of the Rings: The Battle for Middle-earth 1 & 2

Every Pandemic game ever.

also, I wouldn't mind to see some PS2/PS3 "classics" on Steam

Planescape Torment
The Curse of Monkey Island
Escape from Monkey Island
Gilbert Goodmate and the Mushroom of Phungoria
Full Throtle
Silent Hill Series
Missing Resident Evil games
Diablo series
Mafia 1
Leisure Suit Larry Series

All Naughty Dog games

EDIT: Oh and Metal Gear Solid 4

Command & Conquer: Generals
Dark Colony

Captain Claw
Empire Earth
Rise and Fall: Civilizations at War

Half Life 3 :(

Empire Earth series.
Warcraft 3.
Starcraft 2.
Mass Effect 3.
Diablo series.
Sim City 3000.
Star Wars Battlefront. (First one, not from EA)
Halo 3.
Tony Hawk Pro Skater 2 - 4.
Re-Volt.
Stunt GP.
Tzar Burden Of Crown.

Nocturne

I will answer this other way, I would like to see something like "steam connect" working in a similiar way as "gog connect", making possible to "copy" games from one platform to other, at the end - beside user would win this platform whose system (steam vs galaxy) - achievements/cards/updates and everything else is better, so there would be more good competition I guess?

I would love to see these roguelikes added to Steam. :)

• Cataclysm DDA (Dark Days Ahead)

• Dwarf Fortress

• Infra Arcana

Non-Roguelikes:

• Neuromancer

Crash Bash, with full Steam support, multiplayer and achievements, think about it for a minute.

Dem Kingdom Hearts games

dragon age 2 and 3

• Shadow of the colossus
• Gears of war 1/2/3/Ultimate
• Halo for PC
• Red Dead Redemption
• Sly Cooper 1/2/3
• Mass Effect 3/Andromeda
• Monkey Island 3+4

Preferably without Windows10/Store/Origin crap... I know it wouldn't happen but as long as we're dreaming. And while we're at it, I wish these were all playable on Linux as well ;-P

Guild Wars 2

I can't believe this wasn't posted yet...maybe I'm the only one that remembers it?

The Punisher 2005

Mass Effect 3 (Origin)
Vanquish (360)
Armored Core and classic Front Mission games (PS, PS2)
Final Fantasy Tactics games
The Suikoden games (always heard they were good, but never got to play)
Sega Marine Fishing (DC)
Skies of Arcadia (DC, GC)

There's a SEGA fantasy RTS called Hundred Swords that had a small release on PC, and was available on Dreamcast in Japan. I never got around to playing it when I had Dreamcast imports, but since they've already ported it to PC, they could just tweak it a bit to get it on Steam.

Sega has a fair amount of property they could use to make new games, or even just re-release the old ones.

• The Darkness
• Devil may cry 1/2
• Silent Hill all
• Red dead redemption
• Gears of war all
• Tony Hawk all
• Mafia

Novastorm

Crusader: No Remorse :E

ICO and Shadow of the Colossus.