This is for those who'd seen the re-boot of Battlestar Galactica.
When did the re-imagined Battestar Galactica become unwatchable?
For me, it was around the time when the show transitioned from Sci-Fi with a spiritual angle (because all BSGs had some spiritual folklore & mystical references [ like the Pyramids of Giza or Oseliks of Thebes] ) to that of a full blown religion demagogue of Kara 'Starbuck' Thrace coming back as an angel/savior.
Sure, you could say that Baltar was always 'talking to entities' like his Cylon girlfriend, Six, but let's be honest ... in reality, he was not too dissimilar to let's say John Forbes Nash in "A Beautiful Mind" a genius with schizophrenia talking to imaginary friends and foes. And I think most ppl around accepted him as some crazy genius since there's nothing intrinsically wrong with talking to one self esp when he's also having sex with her so it definitely helps in the loneliness dept, given the desperation of half the ppl on the ship.
After Starbuck was angelified, the show became irritating where each episode was about vision and faith. That's when the show became some Sunday morning liturgy than an outer space Sci-Fi drama with AI/Cylons and the human condition out in the void. It was nearly 100% unwatchable and preached continually, taking itself far too seriously for a Sci-Fi show.