If you watch the video from gamespot.com they say it will only be for the 360 and PS3 right now. They said they will release them for PC at a later date. Never specified a date for PC but it will be soon.
I absolutely suck at those first person shooters like that. The last one I played well was 007 on the Nintendo 64. That and I do not have the time it takes to get good and make progress. I have tried a couple but am terrible