Pseudo spoiler alert: skip this post if you want every single detail to be a surprise.
Personally I think the movie was absolutely horrible.
The characters were 2 dimensional and the plot was forced and discontinuous.
Also I was dissappointed in the gunplay. There were a few moments when I was impressed but for the most part I wish I had saved my 8 dollars.
The use of the .50 calibers at the beginning was good, it was a seemingly professional job. But then they turn around and protray those guys as a bunch of beer drinking trailer trash who 'stand guard' by sitting outside the trailer, under a light, while drinking a beer.
In order to catch the bad guy (who turns into a minor bad guy compared to the big bad guy who was never caught) they imported several thousand kilograms of cocaine/heroine for the big bad guy and then allow it to leave their control.....why would you ever do that?
The bad guys put a loop of det cord/explosive around the neck of the hostage but then 'wire it' with an alligator clip rather than a blasting cap and the wire is only about four feet long....
When the good guys take the trailer down they 'creep up' on it individually, facing in all directions except towards the known threat, and after one of them manages to get 'eyes on' the bad guys inside, rather than stay put and direct the good guys she stops watching as soon as she verifies that they are inside. They fail to stack, or even make a dynamic entry. Of course the bad guys inside are not suspicious when a 'pizza man' rings the door bell. After gaining entry into the house they fail to neutralize anyone or to take up dominant positions around the room. A long and unecessary speach follows before shooting one of the bad guys without warning (why not shoot him right away instead). Also, one of the good guys watches while one of the bad guys pull out a knife, and then runs at him. Rather than shoot him at any point during this encounter he grabs his own knife (or at least one knife). After stabbing the guy he then shoots him in the head once he is down (I guess to show how tough he is).
The bad guys behind the fifty-cal's in the second encounter are invisible to infrared as long as they leave their blankets over them. Of course it is always necessary to throw away your concealment before taking a shot as a sniper, thus exposing yourself. Also, one of those guys was kneeling with a .50 rather than laying prone and shooting under the railing.
The good guys know the bad guys are setting them up so they bring 2 snipers and have a swat team standing by. The snipers only shoot the other snipers and leave the vice cops to battle it out with the drug lords.
There were many other parts about this movie that frustrated me, but I don't have time to lay them out right now.
I did like the scene at the end where paramilitaries raided the big bad guys house in South America. That seemed pretty well executed, though they had way to many entrance points. I suspect that it was cheaper to hire real soldiers for that scene than actors.
Those are my thoughts. If I think of some more I will post it.