Yes, it would be in all public rooms (examples below). I gave a small example of what how the MOTDs would adjust based on how much experience the users have in the game, each different MOTD would be a different message.
In Beginner rooms, it would be essential that we start them out by linking them to the forums and telling them about teachers, learning how to play, and asking questions in Beginner Sanctuary when something is unclear to them.
In Semi-Pro, once they are starting to learn, it would be an interest them to tell them about items to help them stick around (possibly a link to the shop and/or Beginner Giveaway).
In Intermediate, once they are somewhat familiar with the game and how it works, it would be nice to link them to the rules to help them formulate their behavior and interactions between users.
Once a user is restricted from all the servers above, it would a good thing to tell them the forums is not only where rules and guidelines are, but that you can make friends to play with and become part of the community through events and clans.