The plot – especially the ending – is unconvincing lacking credibility but this film is very watchable because of Luis Tosar's performance. He is able to change facial expressions on a whim depending on whether he is Jekyll or Hyde.
There is a doco."The True Story of Charlie Wilson’s War" (2008). I'm not a fan of dramatisations – this one has star power distractions & therefore you could question whether its aim is to tell an accurate story or entertain.