this list is lan based, and for a team of friends working together against the baddies, rather than each other, cos that's what we do, with one exception.(not lan based I mean)
Quake 2 has coop, bloody good too if you can cope with the colourless graphics
the original "unreal" has good coop, as does the addon "return to napali"
there where also a couple of mods for unreal tournement and 2003 that support coop.
Will rock also had coop that's nearly as good as the serious sam series.
splinter cell is only two player coop, no one lies forever 2 also has a coop mode all be it slightly odd.
don't discount dungeon siege 1 and 2 plus addons and mods, I know they aren't fps but still a damn good laugh when you run out of fps options.
Also Guild wars is fanbloodytastic as a coop game, again not really fps but depends on what your priorities are for a coop game.
Just to distroy any street cred I might have gained from this post I must add that
daikatana also has a three player coop mode, and its not bad!!
also if you get totally hooked on the coop thing and are still reading this post, then there is baldurs gate 1 & 2 plus addons and neverwinter nights.
long live coop thats what I say!!
turbotoes
and that lot is a fair few months of anybodies game life
