This is all you need to know about this movie and it will save you from wasting an hour and 20 odd minutes of your life:
Robots kill people and only people and can't go above a certain elevation.
The reason why they kill people or why they can't get above a certain elevation is not going to be explained... and it doesn't make any sense.
If they're robots, then why program to not go beyond a certain elevation... also if they detect humans based on the fact we exhale carbon dioxide , how do they distinguish between animals and humans?
I mean why explain all that, if you can have dialog and exposition dumps about people and events that you haven't seen and/or care very little about...
You can really go on forever and pick this movie apart, just take science lady for example.
She stays behind , while mr Mackie drives off and experiments for some time to finally find the solution at the exact moment one of these robot things attack her.
Now I don't know how much time passed, but as she had time to make a batch of bullets I would argue that it would be impossible for her to get ahead of mr Mackie and yet again commit a movie cliche of showing up in the nick of time
The only good thing about this movie is that the annoying blond lady got clipped and isn't shown to have survived the ordeal at the end... as that would make it a trifecta of cliche's.
Anyway anyone involved in this that actually thought it was good, should never work in entertainment again...