[KaVir]

The point of my system is that it doesn't compare the mud with other games at all - the ratings are all relative to other features of the same game.

It is, but if any player can freely rate categories then the vast majority will give either top marks or bottom marks to every category, regardless of how well (or badly) the mud in question has actually implemented the corresponding features. This can provide some insight into the number of fan boys and disgruntled ex-players each mud has, but sadly offers very little else - while my approach at least forces the players to give some insight into the strengths and weaknesses of each game.