I really enjoyed the cold war era Colossus - The Forbin Project (1970).
It was an interesting and intelligent movie.
It introduced a great new theme and concept and may now "occupy the field" for those who remember it.
The only problem I have with it is that any new movie based on the same or a similar theme will be accused of copying Colossus - The Forbin Project, even though the concept is simple and can be independently conceived.
This is significant, because modern military technology has advanced to the point that armed unmanned aerial vehicles (e.g., Predators armed with Hellfire missiles) have already been used in the War on Terror, and in the future, one can envision unmanned naval and land military systems.
At some point, the technology may develop to the point that there will be fewer or no humans in the control loop of these fighting systems. For example if the control communication link with an unmanned aerial vehicle is lost, the vehicle must be capable of operating in an autopilot mode.
Although Colossus - The Forbin Project dealt with computer-controlled nuclear missile launchers, modern technology allows for much more than missile launchers and missiles to be remotely controlled by computers.
The fact that Microsoft has been lobbying hard and in many cases successfully to get its Windows operating system into embedded military weapons systems could itself be the subject of a science fiction/horror movie. And such a movie could even involve viruses!
The basic idea behind Colossus has been around for a long time, at the very least since Capek's R.U.R. (which was where the word "robots" originated) or even Frankenstein, which I believe was an acknowledged influence on the novel writer. Not to mention 2001's HAL and Forbidden Planet's Krell underground being audio/visual influences.