Recently, it was announced that Vivendi Games will release FEAR's multiplayer for free and are renaming it as FEAR Combat. It will be release on August 17 and all you need to play it is the rig and a game key which can be obtained by registering upon release.
http://www.joinfear.com/us/
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It will be PB supported and have thirdparty content that is downloadable. I am not sure about modability yet. All in all, this could potentialy replace WolfET for better graphics and being free.
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Although Im not quite sure abou gameplay, I have played it before, it wasnt that bad but it is more of insane running and gunning with a senseless tase for destruction armed with sh+t loads of explosives which can sometimes in one hit
vaporize anyone in front of you. its like Quake with semi-modern-semi-scifi guns. The retail version's multiplayer didnt quite do that well, so who knows.
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BTW, you all may think FEAR's AI is all powerful, its not it relies on the mappers design and the coders script to know wha to do. America's Army's AI is suppose to be much better by actually being dynamic and random and acts upon your actions properly utilizing their surroundings. AKA Military grade AI used for training simulation.