Three. None are any good though.

Killzone, Black and one of the MoH games (can't be arsed to remember which). Used to have a few more but I gave a bunch of games aways a couple of years back so I have only about 60 PS2 games left here.

Zero on PS1

Zero on PS2

Zero on PS3

Zero on PC (I think)

I've got some TPS though.

12 , and i'm not even a huge fan of FPS games , i just have a huge ass PS2 collection.

3 from my 115 games and that's counting Killer 7 (I don't know if it's consider an FPS or not). PS2 was awesome, such a variety of games.

Zero, I was playing fps games on pc back then. Still not really a fan of playing fps with a pad. It was refreshing to play metro 2033 on the pc, although also sobering experience having to regurly dive into the options screen to keep the framerate up.

i could say one (killzone) but i got that so i could catch up on the killzone story needless to say i didnt finish it because playing ps2 games on a HD tv is imo impossible

Zero.  I hate playing FPS on dual analogues.  Makes me wonder how I managed to play so many hundreds of hours on Goldeneye/Perfect Dark, to be honest.

1, I was never a fan of FPS on Sony consoles.

0. I used to think FPS was the worst genre ever thought of......until I bought Modern Warfare.

I only really buy them now since I have no RPGs to buy. I was forced to turn to a different genre until I can get a game to come to my system.