Well. I've been playing RoD for just four years and I tried other Muds like Petria and Achaea.
Though I found them pretty original and interesting there's one thing I've not found anywhere outside RoD. Its the community, the way players interact one on each other and create their own social structures. Don't you think this is merely accidental, what makes RoD so peculiar is its player oriented feature, meaning that structures created by players are planned and thought previously. The word is big, you have true fellows to play with and there are challenges that even a bunch of very experienced players wouldn't dare to face. Cant miss it: telnet realms.game.org 4000