Although I like score a lot, I haven’t used it as much as intended.
I think Joey’s points are very good. Although it doesn’t have to add up to 100 unless you’re purely measuring how far you are through the game! Infocom used scoring of 400, usually (going up in 5, 10, etc.) or 80 for Planetfall (going up in 2, 3, 4). My favourite scoring management is from Curses. It goes up in scores of 6, 3, 2, etc. I don’t know why. Also Trinity, which uses a similar method, but with a nicer rounder number.
I talked about this (although slightly differently) in this thread: Score, WHY?