Possibly the best depiction of post-traumatic dissociation in any game I've played, ever, and for that alone it deserves 5 stars. BJ doesn't go crazy, he doesn't hallucinate, he's just disconnected from his life until triggered, upon which he flies into a murderous frenzy.

Game's also really good so that helps. Well-made levels that are just open enough to make encounters dynamic while not so open it feels aimless. "Combat stealth" is the promise of FEAR's AI fulfilled. It's just good! Shame about the sequels.