As with any action movie, this film must be taken with a grain of salt (sorry: couldn't resist). Don't think, just watch, anticipating a continuous series of perils narrowly escaped by nearly, but not completely, impossible feats of body or brain. Why a 7. Several reasons. 1. A flaw (I think). The double-agent Colonel has three stars (Lieutenant General) on his epaulets, not a silver eagle. 2. Our heroine kills only bad guys: misinformed American agents, cops, and soldiers she merely kung-fu's unconscious (and they stay so throughout the particular scene). Deliberate? 3. Speaking of bad guys: they're all male - despite the background brainwashing scenes showing boys and girls. Ditto for the good guys: Jolie is the only female (who speaks more than 5 words) in the flick. Deliberate? 4. When Salt is trying to convince Peabody that she's on his side, she comes up with several iffy reasons, but not the obvious clincher: "Ask the President when he recovers who was the bad guy - me or Winter".
Review of Salt
