FEAR is actually a really good FPS that holds up really well today.
Its a great break from the mindless military shooters out there. This game actually has a very interesting story and will scare you at times. I always try to use my flashlight during some of the scary parts but in some cases they disable the flashlight and use this noir film grain to really creep you out. As a shooter i'm actually really surprised how much I love this game.
The AI is actually pretty smart, calling out positions or ordering out moves like "He's behind the table" "Flank right" "Regroup" and flipping over tables or pulling down cabinets for cover. There is a slow mo feature but I haven't really used it. There are some puzzles too and hidden areas.
I really enjoyed every moment with FEAR. It was a refreshing experience when it comes to shooters. I can't really put my finger on it, I only can say I just fell that way about this game.