I found this pretty good. The acting and incidents and the camera movements were so real and all made sense. Single camera concept was used and was executed well to a certain extent. Since it was a single camera concept there has to be less cuts so scenes were lengthy which would have been difficult to film since a small mistake can lead to the whole scene being retaken. So on all those technical counts I think this was a good film and it deserves a bit more than 6, I would give it a 6.3!
The acting and incidents and the camera movements were so real and all made sense.
The acting was soap. The camera movements were so coincidental, and staged (meaning capturing absolutely everything going on in one frame) that they were hardly believable. In a real situation, there'd be so much fuss and adrenaline that the camera would be moving all about the place. It's bad, mostly because, it wasn't innovative enough. A shot-for-shot remake. Absolutely pithy. [REC] was far more original - there was so much more depth that Quarantine skimmed over. [REC] was, respectably, very original.
They can remake [REC] shot-for-shot all they like, but never jeopardize the authenticity that [REC] had. Otherwise you're just spitting in the face of a great movie (not a classic, but a great one) and adding insult to injury.