I realized the moment I fell into the fissure (Score 3, Insightful)

To me the best thing about Myst was that you were alone and trapped in a mysterious place left to discover what happened to the world and its inhabitants. In a way it reminded me of Planetfall. You "crash land" onto a world and have to fix what is wrong and find out what made it that way. I don't know how you could extend that to an online MMORPG. I never played it though so it may be the best thing since free cake...but the original with its isolation, loneliness, and haunting music is what made it fun.