Matt Damon's Jason Bourne isn't the lead. That's no spoiler..anyone who has seen posters or trailers knows that. Jeremy Renner ( Hurt Locker, the Town) is the new hero Aaron Cross. Renner is a good actor and he quickly eclipses all memories of Bourne and makes the role his own.
Rachel Weiosz is the female lead and its the first time that the hero in this series has had a female co-star who makes an impression and has a fan base of her own. Both actors are excellent. The relationship between them works on many levels and Rachel's character is an important element of the story. Bourne's female leads were either an encumberance to him to be cast aside ( Marie) or a tacked on love interest to provide a trailer moment (Stiles).
The action is handled better, not that its better staged - the action in this series has always been first rate- but now that Greengrass has gone its less frenetic in its editing so you can see what is going on.
All the cast are convincing and the good news is that a sequel has already been greenlit so we'll see these characters again.