I liked it.

Rating: 9/10 (16 August 2012)

It had a few flaws but overall, I liked it. I think Jeremy Renner has a really marvelous ability to blend toughness and vulnerability in a way that a great many actors don't. As such, I actually found Aaron Cross to be far more relate-able than Jason Bourne. He projected this undercurrent of quiet panic throughout the entire movie at the very idea that he would revert back to his former self – a poor man's Forrest Gump, as it were – and I found that to be both intriguing and sympathetic. He didn't want to go back to what he'd been, and with very good reason. Another thing I liked was how Aaron wasn't the one to survive because he was somehow better than the other agents but because he got lucky.
Edited to add:
I saw this for a second time and, as a result,felt the need to come and post a few more thoughts/comments. I've never been much of a Matt Damon fan, so I didn't miss him at all, and as stated above, I found that Aaron came across as more relate-able. Jason Bourne was a blank slate the way Matt portrayed him, so while I enjoyed the other movies, it was largely in spite of Damon rather than because of him. I'd be okay with never seeing Jason Bourne in any future films, though they can reference him all they want. So Matt, please be sure to keep your word! Jeremy was damn good, and I am pleased he's becoming more high profile. And yes, he was HOT in this movie.
Shame that the film is getting negative reviews, but not that surprising. These movies put Matt Damon on the map, so anyone invested in his involvement would be a hard sell.
I also thought that Rachel and Jeremy were extremely convincing with their deep connection in a short amount of time. Often, I roll my eyes at such developments, and never really bought Jason and Marie's love story. Yet, I found myself invested in Aaron and Marta. Rachel Weisz always manages to convey an inner strength in her roles while being vulnerable. Given the saturation of the physically kickass woman in movies these days, it's refreshing to see more of a balance in a female character (in an action film). Though her final actions on the motorcycle were pretty badass.
All that said, the movie did end abruptly, and left me wanting more and I very much hope that we get it.