I saw it last night. A few thoughts.
The basic idea for the plot is actually pretty good. It had to have come from Cameron. People have probably been asking him since '92, "Why didn't they just send a bunch of Terminators back?" And so he went with that- but then that Terminator comes from a future that never existed, which is a pretty interesting idea, and then they just put a plot on top of that. AND... it was ok.
The biggest problem is the dialogue. It is just dull dull dull. What was the final line before killing the villain, something like "Time to die fucker"? Absurd. Nothing even remotely approaches the nuance of "What's wrong with Wolfy?" I'm serious... you remember it, don't you? I bet you can't recall a single line of dialogue from Dark Fate. When it shows Arnold with his family, I was waiting for some sort of comedic moment, like the smiling scene in T2, but no, nothing.
Dani's is not really a bad idea, but her character development was totally unconvincing. And that Gaf poster was right that said the San Junipeo girl looks just like Dylan Rooff. Going into it I wasn't annoyed by the wokeness, because T1 and 2 and 3 were all strongly female stories, but it the wokeness honestly did get to be a bit grating.
I got a bit of a Poe Dameron vibe from Arnold's conversion. "I gained my humanity because I just recognized what was right." Vapid.
The action was generally pretty good, but it just didn't have that hardness and brutality that T1&2 have. I don't feel like I wasted my money on it, unlike Genysys, which I will never forgive.