Avalon: The Legend Lives
Avalon is not a fair land, there are no laws, there is no justice, except what the gods or your peers enforce. But that is just the beauty of it.
It can be frustrating if others stand in the way of your 'great' plans, but it can also be very rewarding when you keep progressing despite all dificulties.
The game has much to offer, fighting (best system I have seen in MUDS so far), questing, politics, warfare, romance, trade, community, ... You will have to mould it though, nothing is brought to you on a silver platter once you graduate from school. Hell, its almost like life itself.
This is the first computer game that has me still addicted after more than a year of playing it.