The story line itself is not entirely bad. A bit worn, but workable for a sci-fi flick. Tired old "set 'em up, pick 'em off" plot. And some awful acting. Awful to the point of funny. One girl, on the plane at the beginning, gripped by the machine's claw, frees herself, and then, with the machine not even touching her, she runs, jumps and throws herself on the floor in a heap. I keep thinking this must have been the setup act for a CGI scene that they forgot to do. It's hilarious.
But the movie spends what seems about half it's entire length reiterating the same scene. Guys standing in front of the machine shooting at it with AR-15's. I mean, it doesn't work, and they continue to spend their entire time trying to shoot it with guns they know won't do the job.
After the twentieth gun battle with two guys standing on front of the machine shooting at it, and the machine standing there unfazed, I'm yawning.