I suppose it did, but there were many FPS before Halo that proved FPS could work on a joypad back on the PS1.
Yes, there were. But I can't name any that I played that literally FORCED me to save my pennies to afford a console. I didn't own a PS1 because none of the FPS's were any good, otherwise I would have saved and bought one as a kid. The only 4 FPS's that have actually made me go out and buy a new console/pc were as follows:
DOOM 1/2 - Bought a pc
COD 1 - Bought a new pc
Goldeneye - Bought an N64, best feeling in the world when I did this.
Halo - Saw it in a shop and my jaw dropped. I got addicted and saved hard for months and got an Xbox. I played it for years with friends at every opportunity and created our own little games up in multiplayer.
Halo 2 - Most of my friends buy Xbox's due to the fun they had on halo 1 and hence, it launched gaming to the masses with it's huge launch.
Nuff said.