ShadowGate is great fun to play, with smooth combat, balanced quests, loads to explore. The areas are well thought out and implemented and the whole world has as realistic a feel as you'll be likely to find anywhere.
The players are generally helpful and friendly to newbies. There are high standards in terms of roleplay, which can take some time to get used to if you've come from a more pk or power-levelling based mud. But if you want to stretch your imagination, make great friends and better enemies, SG is probably as good a place as anywhere to get used to Roleplay!