This is a fast paced, interesting movie that has many twists and turns, most of them that you won't see coming. Angelina Jolie has never looked more confident and beautiful, and some of the ideas in the script are almost brilliant.
I say almost, because the more you think about this movie after-wards, the more highly improbable, and less intelligent, this movie seems. And, it only seems to get worse as the movie goes on, requiring the characters to do more improbable things as the movie moves towards the end.
I'd say that any of the Tom Clancy films, or even the Mission Impossible films, give you a better experience than Salt.