I'd put BioShock Infinite at the top, followed by Bioshock, and then stop.

Very happy they gave some credit to Escape From Butcher Bay! THEY ARE WORKING ON A THIRD GAME AS WE SPEAK (According to Vin Diesel)

Bioshock Infinite should be higher. I understand that certain games have impacted and influenced the FPS genre, but this isn't a list of the "most influential", it's a list of THE BEST.

lol acting like ODST is a real game

and acting like it's better than Reach

IGN you're funny

Thanks for posting. Phew, I don't really care for more than half this list. More than half of the top 20 included.

It seems they paid homage to nearly all of the classics.

No resistance and no killzone 2....
and crysis3 is in the list.. I'm sorry but that game is nothing more than eye-candy

bolded    yeah it is! 
I remember back then  4 players teaming up against DARK BOTS with a pacifist bot thrown in just for the lulz (and the "drunk vision" after he slapped you)  fuck yeah.

I rented PD right after its release. I don't know why, but I have not enjoyed its multiplayer the way I did Goldeneye's.

Well, it has first person perspective and Samus does a lot of shooting. ;)

I suppose, but that makes it an FPS as much as Super Metroid is a Third Person Shooter for its camera angle and the main method of attacking.

First Person Shooters, at least as far as I understand the term, are games in which the shooting actually is the main focus of the game. The game generally sacrifices non-linearity and exploration elements in favor of a much more linear or in some cases level type structure so that it can easily control which enemies you run into, and, by extension, where you're going to be fighting them an attempt to make the shooting element of the game the most enjoyable one.

On the other hand, shooting is pretty clearly not the main focus of the Prime series. That would be exploration, and a quick look at the old GC control scheme is all you need to know that Retro did everything they could to make the exploration part the main focus while shooting took a bit of a backseat. Not to say Prime's control scheme is bad in any way, but it's not one that would work at all in your standard FPS type game. Heck, they give you a lock on that easily tracks essentially any enemy in the game and makes the major challenge of combat figuring out how to kill an enemy and avoiding their attacks, since aiming is no longer a challenge. I can't think of any game that's main focus is shooting removing all challenge from the shooting portion of the game; and on top of the extremely non-linear design of the game and the huge focus on making exploration the most enjoyable part, I'm far more inclined to call Metroid Prime an adventure game that happens to use shooting elements rather than a shooting game that happens to have exploration elements.