Have to agree with the above, I enjoyed the film but wanted more from it. There was a surprising lack of direction, or at least the sense of direction was lacking for me.
We obviously know where it's going once they are told that they're stepping on the cartels toes, but even then, as stated above there's scenes like the wedding and all I was really thinking there was ok this is the point where I'm being made to care about these people, and the eventual payoff is one or both dies. And they telegraphed the ending very badly too, basically once the conversation happens about looking after kids/wifes if anything happens, you know from then the opposite will happen.
I liked it, and I'm by no means here with a million ideas that would make it "better", but it fell way short of blowing me away, which was a disappointment to me.