I've played a lot of FPS games since the first Wolfenstein in 1992.
I'll skip over the titles that everyone knows and will mention one unique and maybe less known first person shooter game that I really enjoyed: "Call of Cthulhu: Dark Corners of the Earth". This game is a "must" for any first-person shooter gamer who likes survival horror genre!
😉
Call of Cthulhu: Dark Corners of the Earth (made by Bethesda during the same years when they were working on The Elder Scrolls 3: Oblivion)
+ survival horror with a nice story (player's character is a private detective)
+ sometimes you are roaming or skulking in almost complete isolation, trying to survive and stay sane; sometimes you are involved in "mass scale" intense "Call of Duty"-like gunfights or action scenarios (San Fransisco police storm a mansion, FBI forces raid a factory, the army storms some occultist mansion, a battleship and its crew defend against an attack at sea).
+ some scenes during the gameplay you'll never forget (
http://www.youtube.com/watch?v=OrddtGDC6hc&feature=related) <- watch 06:20 - 8:00
+ going insane when looking at gory or scary things, getting hurt or running out of bullets (blurry vision, hallucinations, shakes, character starting speaking to himself and he can even commit suicide if insanity gets to extreme)
+ somewhat realistic injury system (for example, if you get shot in the leg, you start to limp, if you fall and break your leg, you start to limp in a different way, then you need to pull out a medikit and use it, which takes 5-6 seconds)
+ some very exciting chase scenarios, somewhat like in "Call of Duty" or "Thief" games (an escape from a town on a truck or a scene in which angry mob storm a hotel where your character was spending his night and you must escape from them without any weapon through the town, bolting doors, pushing furniture, dodging bullets, hiding in shadows)