One legendary game.

[Big_John]

Interstate 76 - for it's unfogettable dialogue and characters and great auto-combat
"Skeeter! Groove! Code six-pack... Code six-pack! Trap! Trap! It's a trap..." those were the days... Why didn't they ever make a TRUE sequel?
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Mechwarrior 2 - for it's unforgettable setting/world design, (Battletech) mech combat and the Mercenaries' game great semi-dynamic campaign and interface design.
"Inner Sphere barbarian: state your name, Clan and unit designation..."
those were the days... Why weren't the sequels not nearly as deep and involving as the old games?

YES!

I'76.. the single greatest gaming experience ever created anywhere ever. ever.

mechwarrior 2: mercenaries is the game that turned me onto computer games (along with civ2). just so well put together.

i'll add chrono trigger.. the best rpg i ever played, put me onto to gaming in general.

and the original myth, the first tactical strategy game i ever played. one of the best game atmospeheres ever created.

there are many others.. but those are the ones the pop into my head.