The acting in the movie was one of the few things that I expected. Matt Damon delivered his usual performance: a cool, in-control soldier committed to get to the bottom of things. The supporting actors all delivered their parts well enough, with Greg Kinnear holding his usual cunning, conniving, corrupt, money-thirsty politician role. However, because, as mentioned before, the film focused on a wider picture, the acting did not put me off the movie in any way whatsoever. The one other thing which the movie lacked almost entirely throughout was humour. It's always nice to get a giggle in between moral implications and people dying all over the place.