Great film - all the characters were believable and realistic. It conveyed the loyalty and brotherhood of these "firms" brilliantly and managed many comic moments.
All in all, very true to life - no characters were unbeleivable.
Tip for Ms McDonald - don't buy a film about football hooligans and complain when its violent. I don't like what they do, nobody does, but your apparent dislike of hooliganism is irrelevant when reviewing the quality of the film. It matters not whether you liked it or not - its was the film that you were supposed to be reviewing.