You have F.E.A.R. and then you have this F.E.A.R.: Extreme edition. Everything here is amped up for better or worse.
Less intervals between combat sections, more hands-on horror instead of the (visions) schtick of the base game. This flavor of horror was better than the base game, but otherwise everything is - at least a bit - worse. If this was the good expansion then thank god I haven't tried the Perseus mandate.

I dropped because my game always crashed at (The L) section and there's no solution that worked for me. Guess that's it for fear.