Alien Nazis invade in the 1700s and you have to manually reload your muskets and mostly fight with your bayonet when they get too close.
OT: Go back in time and make Wolfenstein 3-D. Or make Quake, Half-Life, or Portal.
GoldenEye gets bonus points for successfully bringing the FPS control scheme to consoles, and the last 2 Metroids get bonus points for successfully implementing touchscreen and IR controls.
But aside from new control schemes, it's Wolfenstein, Quake, Half-Life, Portal.
Best level design award goes to Doom 2.
First online award goes to Doom 1, right? I forget. I played it modem-to-modem style, and tied up my phone line.
I still call new FPS games Doom clones.
http://en.wikipedia.org/wiki/Doom_clone