Hate to sound like a bit of a cock (you'd think I'd be used to it by now), but er... the FEAR demo wasn't all that great. Some of the scares were real nice - the silhouettes of people you'd see out of the corner of your eye and stuff, but the graphics were nae great shakes. Black on the original xbox looked better.
Also, I discovered last night that playing with the sound turned off really ruins the experience.
well it is just a port of a ~1 year old PC game, innit... i thought the graphics were just too clean - the textures and that - but the visual effects were deadly.