I think it has got more and more scripted as it's gone along. Now, they narrate everything 'Oh, he's going into the bedroom', 'Look!! She's got a gun!!', and when they watch a film, no matter how famous it is, none of them have seen it, and they all appear to be amazed when the most popular scenes in the history of cinema play out.
I still watch it, as I really like some of the families, but it does put me off. This thread has reminded me that I didn't see it last night, as I was busy, so I'll watch it later this evening.