There's a nice sense of foreboding built at the start, with stark Alaskan landscapes, and a rugged, ragged-looking Renner clambering through it rather expertly. This is juxtaposed against Edward Norton and Stacey Keach, prevaricating in suits in Washington as they deal with the fallout of Jason Bourne's escapades. It's here that the film is most interesting, laying a groundwork that is actually rather elegantly interwoven with what we know about Treadstone and Blackbriar, with cameos from various major players that serve as a constant reminder of the climate of intrigue in the world we are being presented.
Performances are good - with Renner in particular going all out as Aaron Cross, notably performing the majority of his own stunts, and brooding both intensely and appropriately as the plot becomes silly around him. Norton brings his appealing brand of fast talk to the antagonist, and the supporting players all make a convincing go of it.
It's nicely directed too, but given the grade of action that Greengrass gave us, this was never going to really measure up. There're a few beautifully dynamic shots - a continuous tracking shot of Cross scrambling up the side of a house, bursting through a window and putting down a government assassin is the most memorable - but for the most part, whilst solid, it can feel a little visually perfunctory.
Then, about twenty minutes in, the story takes its uncomfortable turn - introducing a pair of pills that Cross has been taking that are...well, it's not properly explained at first, nor is it fully explained by the end. It feels a little cheap in terms of story-telling, using facts that the characters have known all along, but have simply foregone divulging to the audience to drip feed us ultimately incomplete information that plays against the hyper-realistic, psychological angle of the first three. Brainwashing, after all, isn't far-fetched at all - and whilst that element is still present, the movie also starts coining phrases like 'virusing out', and peppering the dialogue with pharmaceutical jargon that feels quite forced, and not in keeping with the precedent that has been set.
It also never manages to make a case for the audience creating relationships with the characters, seeming to assume that we'll dislike or like the characters based on who they are aligned with from the previous films.
In fact, were it not for the fact that we know Cross is meant to be the Bourne character of the piece, his character could be construed as the villain - a drug-addicted psychopath who more or less kills indiscriminately in pursuit of what he needs, as the powers that be do whatever they can to stop him. See this without knowing the story, and you'll likely be left scratching your head as to exactly whose side you're meant to be on.
Ultimately, this is something of a disappointment - visuals that have dropped significantly in intensity, and a muddled plot that is both deeply rooted in, and yet somehow in polar opposition to its prologue, not really working on its own, nor as the Legacy that it purports to be. The performances and the action are entertaining enough to buoy the film just above the surface, and if we want to see Greengrass and Damon back in the saddle, it should be seen, but beyond that, it's the first real let down of the blockbuster season.