DOH.

I like MUDs where I can build rooms. I know nothing about codes and only an intermediate level of web sites. I understand real well the concepts of building. Also, I can express myself throught the areas and rooms I build. I also try and make my rooms look very interesting. I'm always trying to find ways to make mobs the most interactive thing, even better than the players.

-Enzo

The thing that attracts me to a MUD is the willingness to work and to accomodate new immortals and ultimately, new players. Other things can be worked on, the aforementioned however, cannot.
My two cents,
-Thirishri

I like muds that have new features that are more than just eye-candy, but well thought out and creative additions which really enhance gameplay.  Stock muds are a turn-off.

Nifty features that make it easier for me to build, such as being able to search on a room number, are pretty high up on the list for me, but so is being able to do interesting things.

The coolest system I ever built on had the ability to add descriptions that would only be displayed under certain conditions, ranging from time of year, to moon-phase, to whether or not the player had specific spells on her or was carrying a particular item. It meant building was a lot of work, but the end product was well worth it.

The players a game attracts.

I don't want to build for a game that brings in hack/slash or pkers who never bother to even once read the room descriptions. Building somewhere you know your work will be noticed is far more worthwhile than building in a place where the main interest of the players is finding the rooms to hide out in, rooms with good things to kill, or rooms with nifty powerful objects.

Go custom or go home. (Code and Data, from scratch, no mod's)

Aldyn, Creator and Founder of Aeledius

Playerbase is a vital requirement for me. I'm not a fan of tiny muds. I also get turned off by over-complicated systems- I like to leap in and start killing things as soon as possible. Although a good dose of roleplay is nice.