yeah... alma IS insane, scary, and damn she makes you see illusions! her trademark is BLOOD, BLOOD EVERYWHERE, BODIES SUDDENLY REDUCED TO BARE BONES, HALLUCINATIONS, AND SOME ENEMIES THAT LOST THEIR LEGS...
All the games are pretty damn good. I have yet to play Perseus Mandate though.
I found that the first FEAR and the expansion Extraction Point were basically the same - they both focused a little more on psychological then shooter. With Project Origin I found that the shooter aspect was focused on a little more.
The small things here and there in the games is what really makes me like them. Case in point: In the first game when your going through an office, if you pay attention you can see Kid Alma crawling into one of the cubicles. Pretty creepy. Also, the security footage sometimes shows something creepy happening.