This is not really the movie described on the tin, the stuff with the cartel plays into the finale but the bulk of the film is an intimate portrayal of the life of LA uniform cops working the worst areas, this is seen through the eyes of Officers Taylor and Z, brilliantly played by Jake Gylenhaal and Michael Pena.
It charts their beat, their family life, their hopes, their brotherhood and ultimately their fate. The banter between the two is great and feels authentic and is often funny.
The films weakness is that the gangbanger characters are caricature's and say nothing but f**k over and over to the point their dialogue makes no sense. Ayer's choice to shoot in a found footage/docu style is something that will divide opinion, I found it was often effective but also erratic in the lack of clarity of when it was the two cops cameras we were seeing from, and why when it wasn't, the film still felt like a documentary.
All in all the the journey of the two leads is compelling, relateable, intense and tragic, you build up such a bond with these two characters that the brutal ending stayed with me long after the credits rolled. 8/10

/10