I have been with MM for about 4 years, 3 of them on my main character. I still have a long way to go before I have done all, seen all, and been everywhere. The game is vast, and so are the differences of the players. MM has always had issues with players breaking rules, as have many other muds. But the down side to MM that most rules are not enforced. For those with a knack for breaking rules, this is the game for you. If a complaint is submitted, often there is a 3-4 day wait before your problem is assessed and rejected, if it is responded to at all. The immortals interact with very few players, and those they do tend to get the favoritism treatment. I have witnessed this first hand, and is valid, but as a player there is nothing that can be done but go with the flow. The quest system in the game is currently under an overhaul, as the game is always under constant development, for good or bad. The clan system of this game is very well though out and works better than on any mud I've seen. The economy is for the most part, stable. Compared to most muds, the developers have kept it very bug free, with the occasional slip.
The biggest pluses are: There will always be a helpful player to assist when ya need it, you'll always have a new place to explore, a new mob to kill, and you'll experience ther ever constant growth of a hard worked mud.
The biggest negs to this mud are: Favoritism, An innefective player help system (Guides) Closed mindedness of the immortals on some very important issues, and of course the half of the player base that gets away with breaking rules and making life hell for the newer players.
Short term players: This game is for you
Long term players: only a few of you could hack it, the rest would be severely disappointed.