Other than the graphics the big thing I remember about Myst is the gameplay was so different than arcade style games, it was a thinking game.

It was one of the main reasons I finally took the plunge and got a PC, nearly $4,000 (1993/94 Canadian dollars) to play a game :P well more than that but it was a good part of it.

At the time a PC in a private home wasn't really all that common, at least in my region, so this hot game on this thing called an "IBM compatible personal computer" piqued the interest of many people and drove sales.