I only watched the first season last week with my 11 year old, after a friend said she'd found it workable as something for the whole family to watch, and that it was both thoroughly silly and also potentially useful as a way of talking about relationships, conflict, ostracism etc with tweens and teenagers. (Me and DS had a conversation about how irritating Meryl's swearing was, and how she didn't seem capable of codeswitching, even in situations where it wasn't appropriate...)
It is remarkably stupid, I admit. My chief joy is the landscape and Claudia Winkleman's knitwear -- the contestants seem like the usual run of the type of deeply silly, over-emotional types that always get cast on this kind of show.
Or maybe I'm being unfair, and it's just the situation of being stuck somewhere for weeks without any external input and no relationships other than the other contestants, and being constantly filmed, that turns everyone into the kind of shrieky Borg that screams in excitement when people walk in a door to the breakfast table, or acts as though the 'murdered' are actually quietly killed off with an axe rather than sent home to their normal lives.
What I would watch the hell out of is a documentary about the casting of 'reality' TV programmes like this one, or even gentler affairs like Bake Off -- how the producers choose a spread of ages/sexes/ethnicities and also need to balance charisma, physical fitness, different personality types etc with a need to cast people who aren't going to go over the edge in a pressure-cooker situation.