This will appeal to those that like the genre,which i do if made well,and this is made well.
Am not sure why it scored so low but can only assume reviewers either were not of UK or were expecting such high things from it that they felt disappointed when did not reach those expectations?
For myself i found it professionally made,interesting to watch and very enjoyable, but then i am from UK and like i may not associate with low life's from other countries i could see the realism of the characters since they are based in UK and i have seen the types being portrayed on a daily basis and can vouch for their realism and appreciate the film more because of that i suppose.
Is not an all action film sidelined with a love interest like Bourne trilogy,but then neither is it boring-its gritty,believable,and well made,and i recommend watching it.