Terminator Salvation is an acceptable entry in the Terminator franchise, though it does have significant shortcomings. While some consider it to be the weakest installment, I don’t share that view; T3 remains my least favorite. It was good to see Kyle Reese again—a fresh perspective on a character who seemed to disappear too rapidly. John Connor felt underwhelming, and I found myself losing interest in his portrayal. Seeing the future that had been referenced in earlier films was welcome, but the movie's overall tone struck me as darker than the others, with the exception of the initial film. The first Terminator certainly possessed a dark atmosphere, supported by its storyline and R rating; this one simply didn’t seem to fit within the established universe. A few familiar lines and images weren’t enough to make it feel connected to the series. Despite these issues, there were still some good action sequences and intriguing moments to be found. It's not a terrible film, but it’s also far from being exceptional.

Source on TMDB