You see Jason Stratham on the cover right? That was the main reason to pick this film. Stratham plays his usual role of mr. touch-guy, this time being a policeman. The Blitz from the title is a serial-cop-killer that Stratham sets out to capture. The story is thin and has a bit too many flaws and the last 10 minutes are awfull. For the rest, you can expect a rough Stratham action with funny dialogues.
Just something for when you do not know what to watch.