Now I'm not comparing this to City of God, just to be clear. I just like coming up with nice summary/pun lines. Connections can be made to a degree of course, but they can stop at the fact that you have kids and criminality as subject mater here. Having said that, the movie may feel slow to some. But it is quite impactful nonetheless. Not to mention that the style (in your face, the actors faces that is) is quite harrowing. It really puts you in the middle of it.
You may disagree with certain things, like the one central female character being swayed by macho and bully behavior ("male" king of the jungle style), but don't forget what world they all grew up in. So this is as authentic (or at least feels like it) as it gets. And the dialog (which may or may not be a bit improvised - otherwise kudos to the actors for conveying their emotions in such manner) is just on the spot! If you are into these types of movies, you'll rejoice and be "entertained". Otherwise maybe you'd like to stay away from this