It's a tale as old as time: Assassin can't recall why they kill or who they are. They slowly start to figure it out and aim to take out their creators. Long Kiss Goodnight, etc.
The kicker here is that it's taken three movies for Jason Bourne's tale to spin out. Having missed the first two films but willing to watch the third due to rave reviews, the basic jist is this: I can't wait for Wolverine to come out soon; which will be like this movie but with more fur and claws. Snikt.