I tried Aardwolf, and I found it terrible.
The interface was ok, although the colours needed a lot of toning down, and the maps were nice, but that was it.
Most of the "exotic realms" I visited seemed out of place, I remember a hotel with a beach and a beauty contest going on. A sort of quest I had to restart a few times because it kept bugging out on me.
There was also a petting zoo somewhere. And a tiny lake with caverns underneath with Tritons in it, it just didn't fit. I'm not sure if the rest of the game was going to be like that, but still...
The quest system itself seemed tacked on. There's the puzzles in the various areas, whose quality probably depends heavily on the area's coder, and the quests given by quest masters that give you quest points... Urgh.
When you get to level 200 you are a 'hero' and can buy another level to become a 'superhero'.
The writing is terrible as well. The very first room I started in already violated several room description standards, such as assuming my thoughts, actions and direction I enter the area from. It also kept spewing descriptions at me that sounded like places from a Disneyland commercial, all magical and splenderiffic. Compared to that, Christmas in Hogwarts is about as magical as a dried biscuit in a lonely tin in the kitchen of an empty house. A dull empty house.
Here's a few areas I noticed in the updates section:
New Goal in the Land of Oz:
A storm is on its way and Dorothy is trying to get home before it hits. She runs for the shelter, but it is already locked. In an effort to find safety, she runs inside, searching for her relatives and is knocked unconscious. When she wakes up, she finds herself in her own house, but in a strange land. She needs help to get back home. On your path, you will meet strange creatures and interesting individuals. Before the storm hits, try talking to the fortune teller. He might be able to help you.
New Goal - The Fortress of Angband:
The Dark Lord has stolen the Silmarils. Elves have ventured into the dungeons of the Dark Lord to retrieve the Silmarils, but so far none have returned. As you arrive, the elves ask for your help. Will you help them or turn aside from the Dark Lord’s scrutiny?
New Goal - Christmas Vacation:
Welcome to the North Pole. Where elves run between workshops, preparing toys for all the good boys and girls for Christmas Day. Santa is passing out presents already so you had better hurry if you want yours. The sounds of Christmas echo through the air. But far to the west a cold-hearted presence fills the air, and a darkness clings to the land. It is the lair of the Grinch, who wants to steal Christmas! Who will stand up and save Christmas?
I mean, really?
Of course, this might just mean this particular MUD is not for me, to each their own and all, but to me this MUD is just terrible.
Plenty of great MUDs out there with large, consistent worlds, great interface, plenty of players and great writing.