I think they've set up some very interesting rules, including one of the better takes on zombies I might have ever seen. That they are setting themselves up to potentially take off the reigns of POV and let loose isn't what I would call turning off rules. Also, I like the fact that [Rec] 2 focuses most of the film on toying with the viewer, setting up expectations from the first and then consistently riffing off those expectations. BTW, [Rec] 3 is supposed to be a prequel, with [Rec] 4 being the film that ties up the entire series, for those that might be interested.