i've also played:
(+) diablo. (you might call it diablo 1.)
(+) serious sam
(+) red faction
(+) doom, doom ii
(+) heretic
(+) duke nukem 3d <--- i just love the sound of the title! <--- gaming network at work...
(+) quake, quake ii
(+) unreal, unreal tournament <--- general network, at work
(+) wolfenstein 3d
and the best first person shooter:
(!) leisure suit larry!