I've started playing those kind of game at my job to help me pass the time. I currently play Omerta, Goal Line Blitz and The Reincarnation/Archmage 2.0 (trying to sign up, I'm having a real hard-time.)
I would like to know what are in your opinion your favorite/best text-based MMO
Yes they are. Or were, anyway. EQ used to be called a "graphical MUD" before the term MMORPG caught on. I think a lot of people wouldn't know what you were talking about if you used the term MUD anymore though. Anyway, not too into them myself, so I can't really answer the OP.