Not a very good game. Very sad, since Fox kills all mods with either IP on sight.
Facehuggers are entirely too laid back. It's very obvious in the Alien harvest animations, but it's really anywhere you see one. They're slow, casual, and entirely unlikely the flying face rapists they should be.
The audio is inappropriate. Nowhere near enough blood curdling screams where they should be. Harvest someone as an alien - a civvie who will blow himself up to avoid this fate if he sees you coming - and he barely makes a sound.
Campaigns are overly short, level design is largely uninspired. The marine weapons are a joke - the pulse rifle feels like a rapid fire BB gun, and if you make the mistake of using the flamethrower on a alien, you're almost certainly dead.
And god, the multiplayer.....
It's a shame, all around. Makes me want to reinstall AvP2 to see if anyone is still playing the multiplayer for that.