You might want to consider the PC from a controls standpoint as well (depending upon how hardcore of a gamer you are). Mouse and keyboard are just irreplacable to some

. Granted, we're going to make sure the controls for the X will be very intuitive, and easy to use. We've played several FPS games on consoles, and having bad, unintuitive controls is something that we really dislike.
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Now if you'll excuse me, I have a code monkey to go strangle.