I watched the last series too. I don't really know what I expected but I was surprised how sensitive it was and how they learnt so much about themselves. I did notice in the last series that the narrator (I think it's Lucy Beaumont) was struggling not to laugh during her commentary!
The activities feel so exposing. I wouldn't be able to do them even though I'm not eligible for Virgin Island. I think the guy who won the last series said his mum watched it - that would be horrible!