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1 - Duke Nukem Manhattan Project - it's a good game, it's proper Duke, and it's spending more time in publishing hell than in stores which is sad.
2 - Metal Wolf Chaos (Xbox) - From Software should do an updated rerelease of this for various different reasons. (But mostly because it's completely nuts)
3- No-one Lives Forever. Doesn't even have to be on Steam, as long as it finally gets rescued from publishing hell at some point.
4- I want a Postal 3. (No, not Postal III). Or Anachronox 2.

1. Mafia (1)
2. The Last of Us (Playstation)
3. Minecraft (Yes I used to play it, and I dont' care, I find it really creative, everyone hates it though.)
4. Portal.

1. Mafia
2. Urban Reign - PS2
3. Overwatch
4. Alan Wake

1. Alice: Madness Returns - I regret not buying this before it was removed
2. The Last of Us - I've heard rave reviews of this game; PS3?
3. S.W.A.T. 4 - hopefully this will be on Steam soon since it recently released on GOG
4. Hmm... Mark of the Ninja 2, maybe? - I really enjoyed the first

1. Mafia
2. Heavy Rain (PS something)
3. Minecraft
4. A good Mafia sequel

+1 Lineage 2 :D

+2 Superdimension Neptune vs Sega Hard Girls ( PSP/VITA) one of those

+3 Dont think there is any i care that much about ...

+4 Sequel to Long Live the Queen D:

1. Mafia
2. Bloodborne (PS4)
3. Mass Effect 3
4. Jedi Knight

1 - The Movies. ( https://www.youtube.com/watch?v=BTIES4BLOSs ) I followed this game for years, reading about it every month in PC Zone, just waiting for it to get released. I had it pre-ordered. It arrived and I played the shit out of it. It wasn't quite everything it had been hyped up to be ( shock horror ) but it was still a great game. It was on Steam for like 8 seconds, and during that time, since I already had it on CD, I had no interest in buying it again on Steam, not realising the future proofing that having a digital copy of a game would be. So, fast forward to now and some 3 house moves later, I don't know where my CD is. And even if I did, the CD drive on my PC gets so little use, I think it may have broken some time ago.

2 - any of the Front Mission series ( PSX/ PS2 ). ( https://www.youtube.com/watch?v=Dk5IcT71NHw ) One of my absolute favourite games is Front Mission 3. I played it to death on the PSX and then, when PSP PSX emulation became a thing, I played it while pooping. Dream come true. I never got any of the PS2 games, because I was literally the only person in the world to know have a PS2. :( So, either, I would want FM3 on Steam so I could play it again and again, or I'd want FM4 or FM5 so that I can experience them for the first time ( disclaimer: Front Mission Evolved is not the same. It's the same name, and same franchise, but not the same game. It's what the CD-i version of Zelda is to every other Zelda game. )

3 - Minecraft. Cop out. I've never really played Minecraft, but I think if it were on Steam ( and got a decent discount during a summer / winter sale ) I'd be more inclined to give it a shot.

4 - Splinter Cell. The rumour goes that a new one is due 2017/8 and I am down for that. And possibly Michael Ironside is coming back to do Fishers voice, which if it's true is just the icing on the cake.

1. don't know much.
2. demon souls / bloodborne pls!
3. battlefield games
4. i need portal 3 !!!!

1 Mafia
2 Kingdom Hearts
3 Robot Unicorn attack :D
4 Payday

1. Wolfenstein (2009)
2. The Last Of Us
3. Titanfall 2
4. Half-Life

1 - Can't remember any, sorry
2 - The first Phantasy Star (Sega Master System)
3 - Diablo (the whole series)
4 - I had a lot of fun with the Bit.Trip Runners, would love a third one.

1 Darkspore (not really Steam/Valve fault here, the game was shutdown by EA, but I'd still want it back)
2 The Last of Us
3 uuuh... I don't know really... Minecraft?
4 a proper sequel to X3 Albion Prelude. Nope, X Rebirth doesn't count, it's more of a miscarriage.

1. Barbie™ Dreamhouse Party™
   If anyone says any other title, they are wrong, period.
2. Ace Attorney series (Nintendo handhelds)
3. None—I stopped caring about hoarding everything on Steam
4. A new entry in Harebrained Scheme's Shadowrun series.

1 - SAW
2 - Call of Duty 3 (PS2)
3 - The Sims 4
4 - The Elder Scrolls

1 - Mafia
2 - Rumble Roses (PS2)
3 - Magic Carpet
4 - Long Live the Queen

1. Dragon Age II
2. Bloodborne (PS4)
3. Diablo III, II, I
4. Baldur's Gate, Darksiders

1. Mafia
2. NHL17 (Xbox One)
3. FIFA17
4. The Elder Scrolls

1. Mafia
2. Uncharted series / The Last of Us (PS4)
3. Diablo series / Overwatch
4. Dying Light (still haven't got chance to try The Following, but I really enjoyed the base game)

1. Mass Effect 3(not sure if it's removed or never released on steam)
2. Heavy Rain (Playstation exclusive)
3. Dragon Age Inquisition
4. Recettear: An Item Shop's Tale (everyone needs some more recettear!)

1 - Mafia
2 - Don't really know any, I think Tony Hawk's Pro Skater® HD brings back the old tony hawk games from PS2 but I'm not really sure
3- medal of honor allied assault cus nostalgia
4- kotor

edit: I think almost everyone misunderstood your second question

1. Dragon Age II
2. Skies of Arcadia (Dreamcast / Gamecube)
3. Ultima Underworld
4. Portal

1. The Movies
2. The Last Of Us
3. TITANFALL
4. Dying Light

1. Wolfenstein (2009)
2. Baldur's Gate: Dark Alliance (PS2)
3. Age of Empires (1)
4. Age of Empires