I did notice that. I think that the other people in their cars were either used to seeing that sort of thing every day in Juarez, or they were smart enough to not get out of their cars after seeing what happened to the hitmen; probably a bit of both. At the end of that scene, you can hear someone from the extraction team say that this would be on every front page in America; someone else commented that it wouldn't make the front pages in El Paso.
Exactly. That was the point of the whole movie.
I don't get why people thought it was boring at all. Not enough exposition? One of the most tense movies I've seen in ages, since you had no real idea how it would play out. Soooo many movies like this you know when you're still at the top of your popcorn who is going to win.
I'll echo your 9/10