One common critique of the Terminator franchise is that after the first two films, each subsequent terminator model (the T-X, T-RIP, T-3000, and REV-9) feels less threatening despite being more technologically advanced than the T-800 and the T-1000.
Why is this? Perhaps it’s because in the first two films, the characters are under-equipped to take on the terminators, and even those who are trained and know about their opponents (Kyle, the T-800) are aware that they aren’t going to win in a one-on-one fight and act accordingly. Their goal is to stay alive and not fight unless there is absolutely no other choice. They’re underdogs, and there’s a very real sense of danger every time they face the T-800 and the T-1000.
Starting with Terminator 3: Rise of the Machines, though, the characters become more willing to fight and are better equipped: in T-3, John, Kate, and the T-850 gain a large cache of weapons. In Salvation, humanity knows about terminators and has the weaponry to take them on. In Genysis, Sarah and Pops have built up an arsenal of weapons over several years and are unfazed to take on the T-3000. And in Dark Fate, Sarah and Grace are battle-hardened warriors unafraid to take on the Rev-9. As a result, the sense of danger is largely gone. The underdogs are no longer underdogs.
There are many ways for the Terminator series to make the terminators frightening again, but I think one important lesson is to take inspiration from, of all places, 1993’s Jurassic Park: the park’s game warden, Robert Muldoon was a big-game hunter armed with shotguns and decades of hunting experience, but even he was scared of facing velociraptors, only doing so when he had to. If the Terminator franchise gives its protagonists and robotic killers the same relationship, that can help restore the sense of danger and terror that’s faded since 1991… that, and stopping the terminators from just throwing everyone around instead of snapping necks and punching out hearts.