Man, I love Steam's sales. I picked up the original F.E.A.R., the Extraction Point and Perseus Mandate expansions, and F.E.A.R. 2 as a package for $10. I already had F.E.A.R. and Extraction point, so I'm playing F.E.A.R. 2 now. One thing you could never accuse Monolith of is not knowing how to establish atmosphere. Much like the first game, I find it difficult to play F.E.A.R. 2 at night. The F.E.A.R. games feature some of the most effective use of sound cues I've ever heard, together with clever scripting to really sell the idea that the bad guys aren't just standing around waiting for you to come to them. They have their own goals and are clearly working to achieve them while Armacham corporate forces engage in running gun battles with Replica soldiers. The AI also deserves a mention: there have been several instances where I ducked behind an object to get out of the enemies' line of sight, one enemy shouted, "Where is he?!" and another actually replied "He's behind that crate!" Now if they had just done something to flush me out, like flank or throw a grenade.
As I said, sound plays a big role in selling the supernatural elements of the game: whispers in your ear whose words you can't quite make out, chittering ghosts, screams of people being torn apart or flayed to the bone. F.E.A.R. 2 also makes liberal use of Interface Screw in the form of blur and color filters to simulate the psychic Big Bad messing with your perceptions. It very effectively sells the idea that Bad Shit™ is going down.
Bottom line: If you like highly atmospheric shooters, you will like F.E.A.R. 2.