User blog comment:MilitaryBrat/Master Chief vs Xenomorphs/@comment-143604-20120201172727

The Xenomorphs won't have too much trouble, to the point of it not being fair. With 50 Xenos coming out of the walls, not only will the marines be dead in seconds, but he will easily be overwhelmed. Oh, you have a motion tracker? That's good- when you're not being swarmed by near instant killing melee aliens. He won't have time to think or to react to the onslaught, and once he downs a couple their high-pressure acidic blood will eat through the rifle and armor. His shields pop with next to no effort, and the armor would dissolve as he turns into delicious Spartan pudding. Assuming, they don't just Facehugger him and we get the Xeno-Spartan running about.