I think there is a difference between talent shows (be they singing, baking or whatever) and programmes like Big Brother or Love Island. Gogglebox is different again, I think.
I watch Gogglebox, but like it less than I did, as I think it is far too scripted now. I don't think it used to be as bad.
Big Brother used to be interesting, when the housemates weren't looking for fame, and I quite liked seeing the 'celebrity' ones in the earlier days when I knew who at least some of them were. I've never seen Love Island, but I saw a couple of series of Castaway and that one where they have to survive on remote Islands (is it Bear Grills?). I think seeing people having to appear to be nice to one another whilst also competing for votes is interesting, but can't be bothered with all the exploitation of some of the 'youth' ones such as TOWIE. I think they forget that they have to back to real life afterwards.
I don't bother with the talent show ones. I liked X Factor for a while, but apart from the Great British Menu cookery show I'm not really interested in the other ones.