It's fun... but different. As with any new game, you're going to need a few hours to get used to it. To be honest I was dissappointed in the first half hour... partly because the graphical settings were being tweaked and the default difficulty setting was at 'master'... took 1.5 clips to waste one dude.
Slowly digging it after 3-4 hours of play.
Graphics - Purdy I suppose, system specs limit me (A64 3000+, 1g ram, X800). Low poly count in general. Textures are ok, somewhat muddy at max settings. Enemies have a low model count; eg, a whole camp of 'bandits' were basically the same dude. I have an X800 and it never ran dynamic lighting very well, so I'm arsed into static lighting only. It's pretty overall, but it lacks the 'wow' effect (ala HL2).
AI - Not bad!, but also strangely retarded in some cases. Like moot said, the groups tend to shuffle their feet and slowly creep towards your cover. They don't seem to be aware of eachothers position, ie a group of three will shuffle slowly (in line), through open terrain towards your position, all while taking massive amounts of fire from you or allies. Guns tend to be very inaccurate (think massive cone of fire, seemingly randomized bullet locations) so they may make it far before reconsidering their death march. Too easy to find a big tree, lean out, and headshot them one at a time just a few feet away. Your mileage may very... depends on your fighting style I guess. I havent advanced enough to see many enemy tactics.
Interface, keymapping, and other stuff - Won't recognize extra buttons on the MX518... grr. Crouch and additional 'low crouch' seems strange for sneaking, you'll know what I mean.
Player movement feels clumbsy and rigid. Crouching is instantaneous. Moving from a jog to a sprint is also instantaneous (and feels like 30mph!).
I dunno, overall I dig it. Just getting to some creepy bellybutton monsters. One dude used a sort of psi attack: the screen blurs and you will hear a very nasty high pitch ringing, supposedly simulating some funky brain boiling effect. I Felt dizzy for a second, then naded the ****er and all was well.
