I played through it again some weeks ago.
Are you playing with the texture updates as well? They really make a difference. Try this guidehttp://www.systemshock.org/index.php?topic=4447.0
System Shock 2 with these mods is as close to a perfect gaming experience as you can get. I had more fun when I played it (a few weeks ago) than I have had with any game in the last ten years. Everything is so good. The atmosphere, the level design and especially the sound design (made by Eric Brosious, the same guy that worked on Thief).
Glad you found this game out.
One of the things I liked the most is that you really have to make use of your resources, as there are a finite number of them. More than once I've had to just adapt the "better flight than fight"-approach; the game design FORCED me to it, and I loved it.
What kind of character are you playing?