For me, enjoyment of a fictional story hinges on one single element. There can be angels and demons in the story, aliens, fairies, children, adults, a musical band, a time traveller, or a plain old bad-copper-done-good-police-investigation-in-Harrogate, it doesn't matter, I can enjoy them all. BUT, if the suspension of my disbelief in the premise fails, I just CAN'T enjoy the story. Because that failure niggles at the back of my mind saying: 'Even these aliens would have protected themselves against Earth-based bacteria, surely the script-writer realised THAT!'
In the case of 'Years and Years' the sheer range of socially, physically, mentally, and morally diverse characters in the featured family on its own falls flat on its face for me. Even in my wildest dreams I can't envisage a family - ONE FAMILY - with such differing physical, mental, observational, backwards, forward-thinking, ecological, immature, emotional, racial, untrustworthy, and just plain DIFFERENT diverse characterisations as this one. I say again... all this in ONE family?
No, it just wouldn't happen, despite what the liberals say about it being 'representative and not literal.' It's unbelievable. I can buy into a nuke being set off, as well as WHO sets it off, even though that's blatant anti-Americanism on the part of the production team to add to the list, but ALL these diversifications in ONE family? No.