Other people have compared it to CS, I don't see it. The weapons are too accurate.
I can name dozens of times in CS that I ran into somewhere I shouldn't be, got shot at, and managed to successfully retreat, spending the rest of the round with low health.
I can't name a single successful retreat in FEAR. Every gunfight I've been in has been quick and instantly lethal.
Maybe this all wouldn't all be a problem if the levels were better, but they're mostly tight corridors. Fights are too quick. Even in the rare open field you die quickly and never get a chance to melee.