This is one of those films that has so many characters in it that it's very easy to lose track of the plot as people discuss their intricate relationships and interactions. I enjoyed the film and was engrossed in it, but frequently lost due to the many twists and turns. Of course part of the appeal is wondering just who is doing what to whom and why, so perhaps this isn't as much of a problem as I'm making it out to be.
It's a very well-made, well-acted film with a great cast and exotic, frightening location. I doubt it will do much for tourism to Tijuana, but it is a very taut, timely movie that will hold your interest. There are a few typical clichés (the hooker with the heart of gold - Mexicans who speak English to each other even when there are no native English speakers around), but these are kept to a minimum. Ray Liota is one of the producers of the film, but it's not "his" movie. In fact, Andy Garcia does a superb job of being quietly creepy and even a bit sympathetic.
If you're looking for a powerful, somewhat dark drama, The Line fits the bill excellently.
