This film requires a very particular frame of mind when watching it. On the one hand, Nick Love has created a fairly serious film, with serious characters and a serious plot. On the other hand, the characters and plot are pushed - intentionally or not - across the line from serious to comedy. As an action film, this is a mediocre affair, and not worth watching without a reason. As a comedy, this film is one of the best I've ever seen.
Danny Dyer has picked up the unfortunate and undeserving title of being a "Mockney"; somebody who talks with a cockney accent and walks with a bit of a swagger, but who is secretly putting it on. I do not in any way believe Dyer, or in fact the rest of the cast, are putting on any of their mannerisms; I believe they are "artistically" enhancing their natural born talents and playing up to the stereotype. The film is littered with quotes which when framed as comedy, are hilarious. This is one of the few films I have ever watched entirely with the commentary; Dyer and Love team up for an hour and a half of pure comedy, including Love's love for Dyer's nan's "Bristols" (Hint: Bristol Citys).
Certain scenes in the film further enhance the comedy. Of particular note is Tamar Hassan's introduction as the owner of the club, "Champagne Charlies", as well as Dyer and Hassan's cruise along the waterfront (serving as an introduction to the setting and the East End born'n'bred supporting characters). The film manages to exude a surprising level of quality given its significantly small budget, and only in a few scenes are the monetary constraints evident. Most of the time though, this serves to further enhance the film!
I won't go into more detail than this; the easiest way to determine whether you would like this film is to prime yourself with clips off the web of Dyer and Love giving some "banta". If you find yourself chuckling with a mild sense of superiority, then chances are this film is worth it for the laughs.