If you're curious about how a designer thinks, this channel is for you, assuming you're also okay with some philosophy thrown in every so often. I mostly work with narrative both in and out of games and much of the content here deals in some way with it though I'm not above talking about FPS design in general.
Follow me on Twitter @_Firesteel_ for more frequent updates on video progress and for my weird trains of thought on games, anime, public transit, and other things.