I've written a 3 essay series for Rock Paper Shotgun. It argues that the perception that "FPSes are generic and the same" accepts the premise that the mainstream AAA game industry dominates FPS design, which is wrong, because the story of the FPS is also the story of modders. It also excludes the many other games that use first person, but we don't think of them as "real" first person games for some reason.
http://www.rockpapershotgun.com/2012/09 ... 1-the-wad/
It's kinda inflammatory / anti-industry in some places -- I think my personal opinion is more nuanced, that the industry is great sometimes and the industry isn't great sometimes -- but right now, I think history is heavily on the industry's side, so I'm going to write from a non-industry perspective to try to balance things out. The "truth" is somewhere in the middle, as always.
Would love to hear your comments and thoughts.