Perfect Game for You

[Red Pawn]

A great, gleaming, industrious city, somewhere between New York City and The City from Mirror's Edge, and four times as big.
The people are few - but they are very good people. The people who matter. The people responsible for the creation of this great city and who are therefore the city personified. The protagonists from Atlas Shrugged, basically.
Your primary goal is to explore this city and meet these people. You are given one item: the Aperture Science Handheld Portal Device.

pretty much just Fallout 3 but like x100,000,000. I mean like huge and forever expanding without a level cap and always adding new enemies for the challenge and the story never ends. Oh and co-op so I can roam the wasteland with a friend.
EDIT: Just thought of some new stuff. Also drive-able vehicles and more customization. And more choices that have huge effects over the game.

This was actually just about the first thing that came to mind, but I like my idea very much. HMMM. Do I really only get to choose one?

[Edit]: Actually, you know what? I'd like to build on your idea a bit, Benmonkey7.
So: Rework the Fallout 3 engine. Regarding New Vegas, it sucks to get a sequel to a game you loved only to find that they didn't rewire, rework or overhaul the engine that made it a problem in the first place. I want smoother, up-to-date graphics - I'm looking at the Modern Warfare 2 graphics engine as a starting point - and spend enough time working with it to remove significant glitches and bugs. I know that in a game this size this will take a couple years at least. I'm okay with that. And for gods' sake, fix those spelling errors.
Now that that's done, I want a better moral choice system. I don't want to have to choose between pre-war pricks and murderous ghouls for the sake of finishing a quest. Give me more than five options, please, and make the consequences of my actions visible and far-reaching, noticeable to more people than one overly-awesome radio host. For instance: I killed that tree-man in Oasis, and his seeds (euuugh) won't spread any more. I doomed the wasteland to another generation of barren-ness, and screwed over any landscaping companies stupid enough to start up in D.C. Can I at least get a "Where are they now" sort of thing like I did at the end of Fallout 2? And there are more than twenty different kinds of gun in existence, yeah? make that evident, please.
...Anyway. I'm going to take a break now.

 

[Vek]

A game where all you do is explore. No story, no other human characters, just you, wilderness, and whatever happens to be on the island. Plenty of hidden collectibles that give rewards for finding them, like giving you tools so you can reach more places on the island. That would be awesome. No feelings of being rushed, just pure, blissful exploration.

Something like this. Though, I'd have it set so that you were a party member on the Lewis and Clark Expedition.

 

[19]

Some kind of Killer7 & Silent Hill hybrid supergame.

 

[Krion_Vark]

Sonic The Hedgehog 2. Yes very old school. But WORTH IT. Mindless 2 hours of gameplay and for some reason I can keep playing it days on end.

 

[subject_87]

Something like Shadow of the Colossus, but replacing 'colossi' with 'cryptic monuments and ancient puzzles', like a cross between SoTC and a point-and-click adventure game, with an overarching plot about the ruins.

 

[Legendairy314]

Most likely the game I've been creating in my head for the last 5 years. Think instead of open world, open universe. That's about all I'm willing to say.

 

[lukenhiumur]

Brutal Legend with a more hack-n-slash style and longer story. More rpg elements would be nice.

 

[Ashsaver]

I guess non linear JRPG with sim dating and multiple endings?

The next best thing i played were Persona 3,and Persona 4

 

[blankedboy]

Morrowind, with multiplayer, way more NPCs, Daggerfall's combat system (except you can move while you attack), all of Tamriel to explore, all of Atmora to explore, and plenty of other worlds (Oblivion, the Astral Plains, the Shivering Isles, etc), minigames, wars between factions etc., a constant supply of new enemy types, and time travel.

Yeah, that'll do for me.

EDIT: Oh yeah, and no 'main quest', but a metric fuckton of ones about the same length as Morrowind's.

And better graphics.

 

[Redlin5_v1legacy]

Something similar to Freelancer. Same mechanics, same story style, same in-depth environments. Someone clone my favorite game

 

[reyttm4]

A game that's mostly adventure but can have fighting too, it's set in a vast land, and is mostly based on the atmosphere it creates, which would be a free one. It could be 2D if it wants as long as it has that.

 

[Apocalypse Tank]

A balanced RTS that turns into an intense FPS, both with skill trees and RPG elements

 

[Pegghead]

A third person game set in a frozen, snow covered post-apocalyptic wasteland with freedom and a heavy emphasis on survival tactics, the plot slowly bleeds through in things you find (Like old newspaper articles and such) and the ultimate goal is to make it to some sort of fabled land where the winter never hit. Winter survival on Garry's mod is pretty close but you spend 99% of your time standing next to a fire and you're regularly killed and eaten by cannibals.

 

[Tattaglia]

An open-world cover-based F/TPS/RPG and RTS game set in space where you start off as a nobody on a space station - just one of thousands of other space stations, planets, moons, and ships you can fully explore - from an interchangeable first-person to third-person perspective. You can pursue the career of an interstellar commodities dealer by buying your own ships and flying them to different buyers around the galaxy like in X3, embark on a life of piracy by stealing/raiding other ships (while avoiding the spess pohlees military and other pirate gangs), sign up for the planetary garrison/air force/space military as a pilot or a marine, or even join a political faction and rise in rank to become the governor of a space station or the ruler of a massive empire. Of course, you'd get to customise your character and specialise in skills as you level up.

That would be cool. *mind explodes*

 

[JourneyThroughHell]

A global MMOFPS/RTS/Global RTS with RPG elements about warfare.

That would be the best thing ever. Like, absolutely the best.

 

[Naheal]

Oh. And fix the whole "you can take missions from the other factions!"

It sucks. You can never count on your allies being allies for more than half an hour, because everyone will tell you to attack your ally. Which you won't, because you just spent half an hour paying them off and whatnot to make them your ally. So everyone gets pissy at you and attacks you.

Which is fine, until they start telling you to attack someone you're actually attacking. And your ally tells you to attack the person you're not. So your ally becomes your enemy, your enemies become your allies, and that one poor guy you're beating the snot out of dies. Leaving you with one enemy (usually your next door neighbor, I've found) and a bunch of allies.

I've found that it's easier to keep your allies when you pit them against one another and pay for their war expenses. Works real well as the TEC.

 

[HT_Black]

A Crysis-style open-ended shooter revolving around a dramatized version of the 4Chan anti-scientology rallies as well as other acts of mischief.

Or maybe just Deus Ex, 'cause that was pretty damn sweet already.

 

[Broceus]

Mother 3. with an OFFICIAL tranlation.

thats.... about it really. its just an impossibly good game.

 

[Naheal]

Perfect game? How about a hybrid between grand strategy, RPG, and tactics?

Oh, wait, there are several out there now that accomplish a similar goal.