As a newbie who has only recently discovered 4D, I thought the Mudschool was one of the more interesting and gentler approaches to teaching the MUD and its features. Usually these schooling areas are quite bland, with lots and lots of rules being thrown at new players. So either they have you slaying endless reams of small wildlife, or they make you read a 100 point international charter on the rules and regs. 4D's school had a pleasing writing style, that actually had me wanting to read the next descriptions and looking at the signs etc. Each room had something different to look at and do, and guiding the player through the different time zones was inspirational. Showing different aspects of the game in a potted and enjoyable manner.
I've been assessing a number of MUD's recently, trying to find one where I'll feel comfortable, but where there is some interesting Lore and some decent written stuff. I like the more involved puzzles and what not, although I must say I'm either not seeing it, or I'm over analysing the problem too much, but I like that solo involvement. I'd like to see more narrative, and have more people come together to take part in it, in a way thats more explore the Lore idea, than tool up and make a lot of character progress and gain status. But perhaps my roleplaying background is trying to find a MUD to squeeze into. When many MUD's take a purely gaming-the-system character progression attitude. I think some of the bigger MUD's on offer pander to the ego-centric loot grabbing ladder climbing 'power gamers' for want of a better expression for them. And so you have more of a playing population - but I'd argue you haven't got a better playing population.
4D is different because it has a lot of flavour within its four dimensions, and they can cater for all sorts of tastes. I'm hoping to convince some of my roleplaying friends from a community I'm in to try out 4D, as a place to come, enjoy the questing and combat on offer, and perhaps join in with roleplaying in the different dimensions.
Anyway, I just wanted to throw in some encouragement from a newbie's perspective here, that 4D is doing some things right, for at least some of the newcomers style of playing. I think the key to attracting and keeping new players, is to provide a place for them to express themselves, but with consideration for others, and respect for the community itself.