Those things were zombies?

Seriously, those were not zombies of any kind. It was ridiculous that those things were called zombies. They looked and moved more like ninjas wearing some sort of stealth devices to me. And also those aliens? They were obviously wearing stealth devices as well. No detail at all in any of the enemies that weren't "human". It amazes me that for what was supposed to be some super advanced game system, the graphics were complete crap. But then again, so was this movie in my opinion.