I put so much time into this when I was about 13 or 14 years old, then played it again 20 years later when it was released on GOG.com. The difficulty of some of the missions is more than my current patience allows for, so I admit to cheating through one of them, but I replayed it in its entirety and have a save game now at the start of Righteous Fire.
Not sure when I will get round to playing that - but man, there's no denying the atmosphere of this awesome universe are still very much there, even more than two decades on.