'Greatest ever' - Planescape: Torment, Fallout 1 and 2, Deus Ex, System Shock 2, The Longest Journey, Ultima 7 parts 1 and 2, Vampire the Masquerade: Bloodlines.
Good - Half-life 1 and 2,
Fallout: NV,
Jagged Alliance 2,
Counterstrike,
Mask of the Betrayer,
Alpha Protocol,
Arcanum,
Baldurs Gate 2,
KotoR 2,
Starcraft 1+2,
System Shock 1,
Ultima Underworld 1-2,
Civilisation 1,2,4;
Alpha Centauri,
Neverwinter Nights 2,
Icewind Dale 1-2,
Wizardry 4-8 (1-3 at the time, as well),
A Mind Forever Wandering,
I have no mouth but I must scream;
Dreamfall;
Under a Killing Moon;
Syndicate;
Dungeon Keeper 1-2,
Outland;
FEAR (only the first one);
Call of Cthulu
Space Rangers 2;
Portal;
Team Fortress 1-2;
Geneforge 1-3,5,
Betrayal at Krondor.
If we can include games that I loved at the time, but are too dated for me to really enjoy now, I'll add:
- Ghostbusters, for the Commodore 64;
- Wizardry 1-3;
- Ultima 1-6;
- Star Trail;
- Doom 1-2;
- Moebius;
- Warcraft 1-2;
- Double Dragon (arcade version - the C64 version I had sucked);
- Joust (both at the arcades and on the Apple IIe). Actually, I'm tempted to put Joust up a category, that one's still fun

;
If only the list of crap games that I've played was as short as that:-(.