Despite me being a fan of the PS3 over the other two consoles, I'd have to say its pretty weak on the number of multiplayer FPS's it has. The only real contenders are, as its already been said, Resistance 2 and Killzone 2.
I personally disliked KZ2. Being pretty is kind of the only thing it has going for it, in terms of gameplay it was just incredibly average. Good to pass time I guess but not much more. Resistance 2 I've heard great things about (especially the co-op) but I confess I've only played the singleplayer mode.
Other multiplayer games worth getting are Warhawk and Motorstorm: Pacific Rift.
I personally disliked KZ2. Being pretty is kind of the only thing it has going for it, in terms of gameplay it was just incredibly average. Good to pass time I guess but not much more. Resistance 2 I've heard great things about (especially the co-op) but I confess I've only played the singleplayer mode.
Other multiplayer games worth getting are Warhawk and Motorstorm: Pacific Rift.