From Kung Fu cinema reviews http://www.kungfucinema.com/reviews/bournesupremacy.htm

it pretty much summerizes what I like about this movie:

One of the biggest complaints lobbed against martial arts and action movies with screening fighting is that the engagements are not realistic. It's true. Fight choreography is typically designed to make the fight like good, and that means having fights last longer and appear more graceful than they ever would in real life. There's nothing wrong with this so long as the fights are well-executed and entertaining. That's the whole point of having a straight martial arts film genre. But sometimes, going for brutal efficiency and the ugly reality of combat has its merits, especially when it's rarely attempted. That's where the Bourne series comes in.