I didn't find the end scarey (spoilers)
I guess the end was supposed to be terrifying, but really, without the computer complex etc, it's really just a baby. It can't kill people by remote control any more. And it doesn't have all the information gathering, camera monitoring, and so forth capabilities that the computer did.
So what is there really to be afraid of? If it says "give me another woman to impregnate" you say "No" and make it sit in the corner or send it to its room without supper.