I just got the game last week... And boy it has been great!
I'm totally in love with the atmosphere. I guess the devs have played a lot of System Shock 2 and Thief 3, as a lot of things do seem similar.
I was getting so freaked out that I was almost jumping around when I accidentally bumped things down from the tables, before knowing that I could do that from a rather long distance (thought I had ghost trailing me).
The best pro I can find, outside the atmosphere has to be the AI. I am constantly getting outflanked and whacked from behind. Sure you can still lay relatively easy traps and get in situations where the enemy tries to hide behind a standing table. But their actions in a firefight seem very professional. Working together to pin you down, then flanking you or covering an attacker.
Some of the weapons are downright cool! The shotgun is normally a weapon I stay away from, I'm an assault rifle guy, but the sheer power of the shotgun is absolutely immense, too much for me to ignore it. Also that odd railgun weapon... Well the effects of it is simply too good to be true.
It seems each weapon is likeable to everybody. Not all are equally good, but those that aren't have an advantage in coolness or wowfactor.
A lot of positive stuff can also be said about the dual pistols... Never have I thought pistols could be that precise or powerful.
Also the enemies are cool.
I usually guage a game on the enemies. Most games have a whole lot of enemies to make sure you don't get tired of them. But FEAR only has a handful, and only two that you meet in any numbers for any lenght of time (at least until where I have got to). But those single enemies are armed differently and use their weapons to their fullests. Shotgunmen advance and attack aggressively, assault riflemen hang back and keep you pinned down. SMGmen love their grenades (and they are fast ones).
But I'm afraid my most beloved enemy only comes in a handful of cases. He is tough, he hides, he is melee, he is hard to spot and best of all he is very intelligent. He retreats after a few strikes.
The first time I met him I thought he was part of some ingame cutscene, so I got very surprised when I suddenly lost a lot of health but had no idea where it came from... A most superb enemy and I would love for him to return later, as after getting ambushed by single enemies (yes they are good enough to take you on 1v1), I was on my toes, barely able to advance fearing he would strike from the shadows. Lovely!