There is something about biographical films, which always highlights an actor's (or actresses') skills, but considers everything else not as important.
It seems the most important part of the actor in a biographical film, is to get every thing right about the character he is playing.
His posture, his accent, his manner of speech and his look.
So much effort goes into building the character, that the film usually falls behind and does not live up to the actor's skill.
Of course there are exceptions, but biographical films usually suffer from this fate.
The Last King of Scotland suffers the same fate.
Except in this film, aside from Forrest Whitaker's good performance as Idi Amin, James McAvoy also gives a…