Unreal Tournament (I'd say UT2004, but since you said before 2004 it doesn't qualify :( ) or Quake 2 for multi-player.
No-one Lives Forever 2, Shogo or Hexen II for single-player.
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Wolfenstein 3D. One of the best games ever made and to me the best FPS. As classic as it gets.
I still remember the days when I came from the school to visit my mom at work and played it there till closing hours. One of the collegues there was nice enough to show me how to play it. Not the best game for a 7 year old certainly, but damn, it was fun :)
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wolfenstein enemy territory/rtcw
quake/doom/duke nukem/UT
soldier of fortune (one of my favourite fps games of all times)
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Serious sam? Duke Nukem? Doom? name your favorite fps made before 2004!
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