Green Zone is not Bourne, nor should it be

I got along to see Green Zone and enjoyed it for what it was – a well-paced political/military thriller. Some of the promotion for the movie – guns levelled, helicopters crashing and the star/director combo – seems to suggest that this is just Bourne by another name. A pity because it stands on its own as well-made cinema. Perhaps they should have made it before Ultimatum?