Variety tips their hat to Albert Finney:
Albert Finney effectively lends his weight, basso tones and a slight Southern drawl to his man-behind-the-curtain character.
The New York Times says,
What’s different about the Bourne movies is the degree to which they have been able to replace the pleasures of cinematic violence with those of movie-made kinetics — action, not just blood.
The movie is thunderously exciting, but what makes it resonate is the wrenching story we read on Damon's face. We've waited all summer for a wild ride to grab us with more than jolts. Now it's here. Hang on.
Roger Ebert says,
I enjoy the movies simply for what they are: skillful exercises in high-tech effects and stunt work, stringing together one preposterous chase after another, in a collection of world cities with Jason apparently piling up frequent-flier miles between them.
"Ultimatum" is a tribute to Bourne's determination, his driving skills, his intelligence in out-thinking his masters and especially his good luck. No real person would be able to survive what happens to him in this movie, for the obvious reason that they would have been killed very early in "The Bourne Identity" (2002) and never have survived to make "The Bourne Supremacy" (2004). That Matt Damon can make this character more convincing than the Road Runner is a tribute to his talent and dedication. It's not often you find a character you care about even if you don't believe he could exist.