Mirkwood is the only mud that's ever held my attention for more than 10 minutes. I started mudding about 6 years ago, and since then a lot of things have changed, remort being the biggest thing the IMM's have added (yah!).
The IMMs on Mirkwood are very active and social, helping to create a very (newbie) friendly atmosphere.
Mirkwood is a mud for both newbies and hardcore mudders. There are tons of area to explore, both original stock and player submitted areas like Alice in Wonderland and the Rocky Horror Show.
Player rooms are being beta-tested as I write this, this is something we've been craving for a long time, and the IMMs have finally found a great way to implement it. \o/
New skills and spells are added relatively frequently, without destryoing the balance a MUD depends on.
I can highly recommend Mirkwood!!!