The London tourist board probably weren't too happy with Adulthood or the "prequel", Kidulthood. London is portrayed as pretty much a poster-child for zero-tolerance policing, with unrestrained violent youth common on the streets. What makes this more unsettling is that the cast & crew interviews don't lead me to believe the cast were actually doing very much in the way of "acting" in either film. As with the first film, the script & direction are fine and the plot, if pretty predictable, hangs together without too much issue. It's a pretty straightforward "revenge" flick, though, and you will have seen it all before in a different setting.
3 stars, then, with the 3rd for technical merit alone.