I really wanted to like it, because I loved The Bourne Identity and because I'm a fan of the books. Unfortunately, Doug Liman's commitment to The OC meant he wasn't able to reprise his role as director, which meant they had to hire a hack like Paul Greengrass.
Whilst the movie had its moments, his inability to hold a shot for more than two or three seconds, as well as his unhealthy penchant for handycam, meant that sometimes you felt kind of sea-sick watching the movie.
For those who have read The Bourne Supremacy novel, don't expect it to be even remotely close to what you see. Where The Bourne Identity managed to keep a few elements, The Bourne Supremacy movie has absolutely nothing to do with the books. Entirely different setting, absent characters, characters killed for no reason, new characters invented. It is, for all intents and purposes, just the producers using the name of the novel for continuity purposes.