I can only assume that people didn't like this film because it was too dark, or it simply wasn't their type of film.
If you like films like Kidulthood & Adulthood I can promise you will LOVE this.
I personally thought it was better than the above said films.
Not only was it very well produced and directed, the acting was top notch! I've never seen (or noticed) Ed Skrein in a film before, and he played his part perfectly - Totally believable, and basically a right nasty piece of work.
All the other parts were played excellently too(with maybe the exception of Kirby's character)
It had a great story that keeps you engrossed from beginning to end, it is shocking, harrowing,and some good humor was thrown in too.
After it finished, I text a handful of friends (who I knew would like it) and told them to watch it asap.
Nuff said, 10/10
