I also had a problem getting to The Dig, but when I finally played through it I really appreciated the game and how it ended...

When I asked people about it they seem to find creed 2 too dark at times and that they missed all the (harsh) shadows from the first one.. So in other words they didn't like the variable lighting that they complained was missing from the original -.-

The pop-in is also worse, and the textures seem lower res. The original ran at a low framerate on consoles from what I understand, so I assume they lowered some things to get it running better.

pop in was about the same but there was less filtering to disguise it which hurt badly but the lower filtering allowed higher populations and some other improvements

I've started restricting myself of buying for the cheap price and have tested a couple of games just to see if they work all right. Those I've never installed though:
Martian memorandum mean streets: Got it as a gift from GOG, i think. Haven't checked it out yet.
Antaeus Rising, Sacrifice, Imperial Glory, both Ground Controls (did play the first's demo ages ago), The Patrician, Tropico reloaded, the Guild, Painkiller, Freespace 2, Arx Fatalis, Commandos 1,2,3, Jagged Alliance 2 and Unfinished Business. I've installed a bunch of others for a few minutes and then uninstalled to play at a later date. The reason these I've mentioned haven't been played is that when installation time of a new game comes, I've just picked something else depending on my current mood.
From Steam: Evil Genius, Medieval Total war 2 (and the alexander expansion), Defense grid the awakening and Splinter cell double agent (too big to download even).
Retail I've got a Battle for middle earth anthology collection where i've only installed the first game, played three missions and gotten sidetracked with other things. Also got a Delta Force pack where I've only played the blackhawk down one and a fallout pack where I've only played part of the first game and not the other 2.
So whenever a new deal comes up, I look at my stuff and I go: I still got a TON of good games to play, why am i spending on stuff I don't have the time to play with? That helps me control the inpulse buying a bit. I might regret it down the road or find an even better deal, but what I really need to buy is TIME, not games. Games I've got enough.

Only 1. Simcity 2000 ... owned it since release >_<
As for Sacred 2 ... I had absolutely no trouble at all installing and running on windows 7. I have the gamersgate version and I have had no issues at all.

My list is too long to show here.
/shame

For those of you that haven't finished Mass Effect 1 or 2 ...
PLEASE PLEASE PLEASE go finish them! I promise you'll be glad you did. I've honestly never been sucked into a story as much as I was with those two games.
It took me 3 tries to finish Mass Effect 1. I kept starting it and couldn't get far enough into it for my it to really hold my interest. However, when I made myself get over that very first initial 'hump,' I couldn't put it down.
As for me, I have never managed to finish Warcraft 3, no matter how many times I've tried to play it.

Off the top of my head:
Kings Bounty
TF2
Outcast (successfully)
Jade empire
Sins of a solar empire
Oblivion GOTY
Overlord
Xeno clash
The witcher
and on gog:
Fallout 2 (got bored of 1 too quick
Descent 3
Sacrifice
Advent Rising
Freespace 2
probably many more really old ones...
oh plus the humble indie bundle - played world of goo before i bought it, but only tried gish.

Nice thread :)
My list of uninstalled games:
PS3 (Uninsalled in this occasion means not played even once)
Assassin's Creed 2
Red Dead Redemption
Uncharted 2
Valkyria Chronicles
PC:
Mass Effect
The Void
Blood 2
Company Of Heroes
Mount&Blade Warband (I have played the previous version though..)
Planet Alcatraz
Overlord 2
Gothic 3
Portal
Trine
Jagged Alliance Wildfire
Outcast
There's bound to be more, but can't remember at the moment...

I have 100s between my consoles and PC, that's why I hate MMOs so much, so much good gaming wasted picking freaking herbs and making potions to raid in WOW. What a tragedy. Even now I can afford to pick up 20 dollar specials on hot XBox games because I'm so behind. I just finished Darksiders and pulled out Mass Effect (the first one). I never finished Fallout 3 (got bored, don't know why really, I played really far into it). I have games that I've installed but only fired up for 5 minutes or less, if at all. I am much more of a collector I guess. Though I love playing games when I get the chance.

Honestly, storywise you're not missing much. Watch the cutscenes on Youtube and you got the story. Play Titan Quest instead, it's a much better game in all ways.
I know there are some hardcore fans that will hate me for the above, but it's true, after the years of waiting, the sequel was terrible, unbalanced and wasn't that fun before or after I played the hell out of it.

Are there anyone else who got feeling that people post their lists here with pride? :p

Shame and pride I guess. Now it´s my turn:
GOG games:
Lure Of The Temptress
Martian Memorandum Mean Streets
Postal 2
Teen Agent
Other sites:
Abuse
Beat Hazard
Broken Sword 2 & 3
Commander Keen
Command and Conquer: Tiberian Dawn & Tiberian Sun
Commandos 2 & 3
Counter Strike Source
Darwinia
Day Of Defeat Source
Deus Ex: Invisible War
Doom 3: Resurrection of Evil+
Drascula
Duke Nukem Manhattan Proyect
Freedom Force vs The Third Reich
Half Life 2 Episode Two
Half Life Opposing Force
Hexen: Deathking of the Dark Citadel
Hexen II
Indiana Jones and the Last Crusade
Kingpin
Loom
Multiwinia
Painkiller Overdose
Quake II Ground Zero/ The Reckoning
Quake III Arena / Team Arena
Quake Mission Pack 1 & 2
Return to Castle Wolfenstein
The Dig
Wolfenstein 3D: Spear of Destiny
Volvo The Game

Lol too many to list (damn Steam and its sales). Maybe I'll come back and edit this post later...
Edit: All right, let's see... games I never installed even once...
Physical copies:
Red Baron
Caesar
Risk 2
Links
Battlezone 2
Majesty 1 + Northern Expansion
Dark Earth
Jedi Academy
Thief 2
Tex Murphy: Overseer
Giants: Citizen Kabuto
Descent 3: Mercenary
Descent Freespace 1 + Silent Threat
Gothic 2
Gothic 3 + Forsaken Gods
The Elder Scrolls: Oblivion GOTY
Re-Volt
Knights of the Old Republic II
F.E.A.R. 1
Die by the Sword
NHL 2001
Cabela's Big Game Hunter
Tiger Woods PGA Tour 2003
Madden 2000
GOG (not listing games I have ever installed non-GOG versions of):
Arcanum
Vampire The Masquerade: Redemption
Blake Stone: Planet Strike
Rise of the Triad: Dark War
Steam (not listing games I have ever installed non-Steam versions of):
Quake 3: Arena
Quake 3: Team Arena
Oddworld: Abe's Exoddus
DiRT
DiRT 2
FUEL
Battlestations: Midway
Battlestations: Pacific
Flora's Fruit Farm
X-COM: Apocalypse
X-COM: Terror from the Deep
Chrome: Specforce
Clive Barker's Jericho
Commandos 2
Commandos 3
Company of Heroes
Conflict: Denied Ops
Culpa Innata
Doom 3: Resurrection of Evil
FlatOut: Ultimate Carnage
Freedom Force vs. the 3rd Reich
Ghost Master
Grand Theft Auto 4
Master Levels for DOOM 2
Overlord 2
Overlord: Raising Hell
Quake 2: Ground Zero
Quake 2: The Reckoning
S.T.A.L.K.E.R.: Clear Sky
Shellshock 2: Blood Trails
I really need to win the lottery so I can quit my job and catch up on my gaming backlog....