[onemoreact]

The man advantages of an RPG style MMO are simple gameplay mechanics, lag tolerance, low server utilization, cheap content, a built in learning curve, built in constructive player interaction, and diminishing returns on extreme gameplay. I could go into each of these to see why MMO golf / the sims / FPS / chess / poker / just about any other game type is much harder to adapt into an MMO framework. But my main point was not that it's easy to create a 3D MMO RPG just that RPG's naturaly work better in the MMO format than just about anything else.