I think that the major point here is that you consider Duke Nukem 3D to be a "standard FPS". You have to understand the 1996 context in which it was released. Prior to that, the "best and most advanced" FPS was Doom. There was no "real 3D", whole maps where flat. You could never stack monsters and players and items over a Z axis.
Duke Nukem 3D brought the 3D into FPS. Because of this 3D, aiming with the mouse became the standard for generations of games. A few months later ID Software published Quake, which was also mind bending. I don't feel like FPS have evolved at all since that time. Better story lines, more guns and spells, more details in the physics engines, but the 3D is still the same for the vast majority of large studio productions.
This is why Duke Nukem is so mythical (and Quake 1), it set the foundation for modern FPS games. Over the time, people forgot about their 1996 experience but where kept on the bandwagon by "Duke Nukem Forever in the following year".
Now I'll agree that the probability that this game lives up its expectations tends toward zero but hey, its like a software game soap opera going on!