I'd go as far to say Myst is the closest a game has come to a work of art.
Myst is also a game that divides people, either people "get it" or they don't. There is no death in Myst, no clock counting down to play against; there is only exploration and puzzle solving. This can give the game a feeling of relaxed freedom although the storyline is so written that it compels the player on, encouraging them to discover what secret lies beyond the next corner.
The graphics in Myst are all pre-rendered, static scenes and the player moves from one to the next like a slideshow but each is beautifully realized. Animations are provided by small QuickTime movies which integrate seamlessly with the surroundings.
The ambient sounds of Myst, wind blowing through the trees, soft music as you explore the various islands, add to this very personal, almost calm experience of playing the game.
Myst's real strength is in its storytelling. The game gives you enough information to peak your curiosity but leaves enough out so that you feel compelled to discover more. The worlds are an absolute joy to explore with may interesting devices and items to ponder over. The puzzles, while quite challenging at times, can be solves with the right amount of lateral thinking.
Myst is indeed as classic adventure game and will remain so for many an Age.