T3 and Dark Fate vie for 3rd best in the franchise for me.
Then it's a bit of a drop to Genysis. Said it before but the first hour of Genysis is great, but then they time travel to 2017 and the rest of the movie just goes to ****. But at least it did okay overseas.
I agree with a few on here Salvation is the worst by some way for me. It had an amazing cast and the right idea, but then they gave it to McG, who at the time seemed more concerned about arguing with Michael Bay on social media rather than getting something as simple as the T-600's wrong (the machines apparently made the first infiltration unit 9 feet tall, according to McG at least, no wonder they lost).