Just finished it. Took me about 9 hours.
Overall, I enjoyed it. However, it just reeks of untapped potential. It could have been a fantastic game if they focused less on the combat and more on the Memory Remix segments. They were easily the highlight of the game, and the last one in particular, was fantastic. Sadly, there are only 4 in the whole game, and they are fairly short. I wanted more. A lot more. Don't get me wrong, the combat was competent, and I thought the Pressens were a great idea...in theory.
The problem is, they made the game far too easy. Even if you're on the brink of death, a couple of combos can bring your health right up again, not to mention there are various healing stations spread generously throughout. The platforming was also extremely simple, to the point where I can barely call it platforming. It's basically 'follow the arrow'. Again, it wasn't egregiously bad, but it wasn't a ton of fun either.
The graphics, however, were pretty great, excluding character models. The city looks spectacular and begs to be explored,. It's just a shame the game is so linear. Hopefully, if DONTNOD have the opportunity to make a sequel, they will take advantage of the brilliant world they have created. Character models are fairly inconsistent, with some character looking great (like Nilin), and others looking a bit shit. I did love the design of the Leapers, however.
Sound-wise, it's a mixed bag. As many have already said, the soundtrack by Olivier Deriviere is fantastic, and hits all the right notes at the right times. The voice acting is a mixed bag. The main characters sound good most of the time, while most secondary characters sound absolutely terrible. This is not helped by the absolutely woeful dialogue. Seriously, the dialogue in this game is cringeworthy, and some of the worst I've heard in a long, long time. Maybe it was intentional, but whatever.
I also enjoyed the story, to an extent. It won't last long in the memory, but I was always eager to find out what happened next. Coupled with the great pacing, you won't find yourself getting bored before the end credits roll.
I seriously, seriously hope this game gets a sequel. Sadly, I can't see it happening. Like Mirror's Edge, it's a flawed game with lots and lots of potential. For this reason alone, I would recommend a purchase. Maybe not at full price, but at £20 or so. I paid £24 for it, and I think it was worth every penny.
Score? 7/10, I guess.