Halo isn\'t really twitch, quake is twitch, unreal tournament is twitch, Halo was that awkward middle-child that didn\'t know what it wanted to be when it grew up. I\'m talking about the original mind you, haven\'t played the sequels really.
Killzone 1 fell into that category as well.
Killzone 1 multiplayer sucked ass, and really, if you\'re playing FPS and its not a Valve game, you\'re playing it for the multiplayer.