Hey all, I've revisited this classic over the weekend. Gotta say, it still stands up as one the benchmark for all first person campaigns. Wonderful game that manages to engender a sense of urgency and a deep immersion in story. As well as the physics based puzzles that keep it from being a completely one dimensional shoot 'em up. For those who have played it, go back and revisit, for those who don't know the game, get it, play it, it is a wonderful lesson in gaming history.
I've got it sitting installed on Steam, but haven't played it for a while. Might give it another pop though!