I think the movie has become quite relevant since recent events, both from the angle of the US-russian relationship, which was the cause, in the movie, of both the US and russia building such a system. And it is also now relevant from the angle of AI taking over the world.
I like the basic plot of this movie more than the one of Terminator where the AI is depicted as pure evil. The AI in this movie is aligned with some human goals but deprioritizes other goals, much to the dismay of the humans.
Or maybe it's also just part of a ploy to kill all humans, we don't know because there has never been a part 2 :).
Nothing bugs me more than an otherwise good movie where its villains keep doing things that make no sense. "Bad Guy" AIs seem to get the worst of this, as a lazy writer might feel they can get away with more because the villain's inhuman nature forms a handy barrier vs audience deduction. The Matrix AI, Skynet are probably the worst offenders that I can think of from the top of my head.
Colossus goes in that delightful bucket of "yep, working as designed . . just a wee bit too efficiently". Putting myself in the computer's shoes, I'm not even a hundred percent sure Colossus/Guardian is even in the wrong, morally. Thermonuclear technology might be genuinely too powerful for late 20th century politico-military systems - I'd buy that.
This notion - of freely giving control to a fantastic machine - was probably as alien to a man from 1960 as letting the computer watch you f*#k. Both of those notions are probably easier sells to the people of today.
I think the movie illustrates the recurring trope that one must always be very careful with what they ask a genie. The genie delivered, but in a way that their creators didn't anticipate and, at least initially, welcome.
The book had 2 sequels, which show that Colossus was working to keep humanity safe. (It would've really helped if Colossus had told us what it was protecting us from, but even computers can make mistakes.)
I like the basic plot of this movie more than the one of Terminator where the AI is depicted as pure evil. The AI in this movie is aligned with some human goals but deprioritizes other goals, much to the dismay of the humans.
Or maybe it's also just part of a ploy to kill all humans, we don't know because there has never been a part 2 :).