Analog sticks make sense for a flight game, where you are pretty much thrusting forwards at all times and only need to worry about two axes of motion. Motion/pointers make the most sense for FPSes, where they are a literal simulation of the action of aiming and firing a gun. Mouse + keyboard makes the most sense for strategy games, where you need lots of hotkeys, precision pointing, and the different mouse paradigms. So, yes, the key limitation is really what the console supports in terms of different inputs, not whether the input was implemented correctly for a certain type of game.
I have the feeling that Sony 'encouraged' Factor 5 to make the controls motion-only, if only so they could say 'hey look, the Sixaxis isn't an enormous gimmick!'.
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I don't know how people can play most typically console FPSs.
It makes them feel 1337 h4rdc0re. Also boosts their ego, especially when they can't figure out how to configure their network connection or router DMZ

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