Mostly a let-down, a pretty simple story attached to too many chases.

Rating: Null/10 (20 January 2013)

It is a bit depressing, seems too many movies nowadays just substitute lots of chase scenes to compensate for lazy scripts. This one fills that bill. The actors are fine, there just isn't a lot to work with.
To start with the definition, LEGACY - " something transmitted by or received from an ancestor or predecessor or from the past " . So, since this is a Bourne legacy, it must pertain to something Jason Bourne "transmitted." I suppose that makes sense, of a sort, after Bourne escaped in the last movie, a decision was made to eradicate the remaining 9 in the experimental operative program.
In fact, as the writer/director explains in the extra on the DVD, the first part of this movie (in fictional time) overlaps with the last part of the last Bourne movie, that is why they had a short reference to Jason Bourne escaping.
Jeremy Renner is the experimental operative, Aaron Cross, that this story focuses on. He is out in the Alaska snowy wilderness in a training exercise when he is being hunted down from Washington by use of a remotely controlled, weaponized drone. But he manages to figure out what is happening in time to escape unharmed. This just intensifies the chase.
The chase is being led by Edward Norton as Retired Col. Eric Byer, USAF. Now I like Norton, but here I never found him believable in that role.
Cross eventually crosses paths with Rachel Weisz as Dr. Marta Shearing , a principal investigator in the experimental program. They forge a bond and together travel the world attempting to get him reverted to normal.
As I said, there are too many long chase scenes trying to compensate for a mediocre story, and the biggest disappointment to me was the very last one. A super operative has been pressed into action to hunt down Cross, and he does, but they are involved in a motorcycle chase. I was looking forward to some sort of fantastic final hand-to-hand combat, but no ... the super operative simply crashes into a steel post and obliterates himself. It was a good result, for Cross, but a bit anticlimactic.