This is a nice review of Natural Selection done by Europes very own boomtown.net
From Boomtown.net Article

Running down a high tech corridor with lights of strong contrast flashing by me. I can hear the sniffling sounds of the alien creatures gaining on me from behind. I take a quick left and find myself in a dead end. I turn around and brace myself for what is coming. My whole squad whipped out – ambushed by small four legged aliens sitting in the ceiling that made fast attacks, killing one of us at a time and then retreating to the shadows. Everybody is gone… but me. I check my ammo meter, making sure I’m locked and loaded. I look up and I see 1…2…3 alien creatures of varied sizes. They make a hissing sound as I squeeze the trigger to unload round after round in to the pack. They scatter; the smaller ones climb up the walls and try to get behind me while the big one goes for a frontal attack. I unload my whole mag’ into the one coming at my front but it just keeps coming. Switching to my alternative weapon, a fiercely fast Automag like pistol, I pull the trigger repeatedly. I shoot another 10 rounds in the beast before it falls down, dead.