SW: Shadows of the Empire: First game I bought after becoming a gamer, I guess my past inexperience with games made this seem like the awesomest awesome back in the day, but even afterwards I've noticed that it's at least fun to play through now and then. Especially the first level. My fastest record playing that level was 2:59, maybe I should break that someday.
Duke Nukem 3D: old games > new games
Shadow Warrior: old games > new games
Jedi Knight & MotS: They've never been spectacularly fantastic but if I only focused on spectacularly fantastic things I'd just have lasers for breakfast)
SW: Rebellion: So underappreciated, one of the most addicting games I've ever played. Spending a whole day taking over every planet of the largest galaxy to find Luke Skywalker might have damaged my brain for good.
Dark Forces: old games > new games
C&C Red Alert: One of the awesomest games ever. Awesome music, awesome plot and awesome awesome with awesome on awesome.
Final Fantasy VII, VIII: OMG THEY R OVERRATED omg i dont like japs america shuld bomb hiroshsmx agen- maybe they weren't spectacularly fantastic after all but I still enjoyed them and actually FF7 made me realize games don't always have to be about shooting things (even though such games like Duke3D are fun)
Max Payne: OMG TEH DIALOGUE R CHEESY- I wonder what kind of a game/movie/whatever doesn't have a bit of cheesy dialogue. Even though the story isn't ultimately spectacularly fantastic, the settings are awesome and I just can't accept that a bunch of other Finns have gone to New York to research stuff for a game)
GTA III: The reason I got a PS2. I'd say it was technically the most amazing game I had ever seen/played at the time, hell, it had enough cojones to be played through at least a 100 times in the beginning of 2002.
Jedi Outcast: Technically/lightsaber-wise neat (for the time), plot-wise utter trash, but I'm still going to get insane amounts of nostalgia from this game because I played it through 12 times in 2002, one of the best years of my life)
Deus Ex: 'nuff said
Games that emotionally/whateverically had an impact on me, but I've played 100% through them only once thus far (or then I've played certain parts of the games multiple times OR I've played just through the endings multiple times):
Theme Hospital: Neat!
Final Fantasy VI, IX: omg VI is over-ated omg IX has colors it sux, yeah like I care about other peoples' opinions.
System Shock 2: Played through it once in 2001, have installed it so many times afterwards but never played through again
TIE Fighter: Empire FTW. Sometimes I say this is the only SW game worth playing through.
SW: Knights of the Old Republic: I'd also list KotOR 2 but that would be only up to the horrendous ending
Painkiller: Old-school goodness.
Republic Commando: insanely fun, too short though.
GTA: San Andreas: Despite not really offering anything new, just hours and hours of awesome gameplay with awesomes awesoming around, it even had a plot that was interesting enough to be followed. A GTA game. Having a plot. Good one at that too.
Civilization IV: The first Civ 4 game I ever played, awesome awesome.
Prey: It's like they remembered that games are supposed to be games, not ultra-realism simulators (albeit with repetitive level archi, but I can forgive that)
No One Lives Forever: Hey, I played through it last week! After having a 1.5 year break in playing too.
Bioshock: What a game should be, king of the currently modern games.
Games that I haven't even played through once yet, but I've enjoyed their gameplay a lot/sufficiently enough that they're at least probably gonna end up on the second list (I guess most new games do, I don't seem to play through games more than once anymore)... or then not:
Jazz Jackrabbit 2 (I don't remember playing through this, but it was immensely awesome)
Oddworld: Abe's Oddysee
C&C Tiberian Sun
C&C Red Alert 2
Chrono Trigger (haven't touched it since I lost my mega-savegame back in 2003)
Hitman 2 (lost the mega-savegame with CT, haven't touched since)
X-Wing Alliance (enjoyed the story a lot, haxed a savegame and played through the final missions once... should play through the whole game somedaY)
Anachronox
Jade Empire
No One Lives Forever 2
These are roughly in a chronological order, for instance I had played DX before 2004 but I didn't exactly "fall in love" with it back in 2000. I've also probably forgot a lot of games but meh. And I guess this most likely is a "OMG GAMES I'VE LIKED" but I think games that I've liked means that they have some special place in my egotistical heart. Even though an Azeri man stole it when I was fighting snow back in 2003.
(Too much text, probably a lot of typoes too I don't want to read through this ever again aaa)