Oh, I agree with you there. So does Roger Ebert. So does Cameron, who has always freely admitted, and continues to admit, that
many elements in the "Terminator" movies make no sense whatsoever.
But man, if you go down that logical rabbit hole on this franchise you'll never come out the other side. Eventually, you'll become
that guy, the one who complains Indiana Jones is terrible at his job, James Bond hates women, and there's no way some cracker farmboy from a hick planet like Tatooine would shoot that well, under pressure, his first time out.
So I guess my only point, my main point, is there's a difference between being unable or unwilling to suspend your disbelief at any given time, and that being a larger indicator, of, well, anything greater than your mood on the night you rewatched the movie. It's not the movie, man, it's you. The movie knows it's silly. It doesn't care.
More semantic rumblings we can all safely ignore: Structure is, roughly speaking, plot. If you don't break the story you have no movie. My argument is that structure is the essence of the screenplay and everything else, from characters to performance to dialogue, flesh that story out and give it life.
Finally: I take issue with the idea that Cameron's films lack characters. He added an entire subtext to Ellen Ripley that was absent in Ridley Scott's film (and further, he actually had the discipline to excise most of it from the theatrical release). And take a look at Sarah Connor. She undergoes an
immense shift from the first "Terminator" to the second. How often do you see that kind of change in a blockbuster franchise? Almost never.