This must've been what the 80s was like if there had been the World Wide Web back then. Same kind of hyperbolic vitriol blown way out of proportion because the show didn't go the way they liked.
Or, imagine the social media reactions when DW went to color and the narratives primarily earthbound. Yeah, some fans would have complained hoe color destroyed the "noir" type atmosphere of the 60s episodes.
Shoot, let's transplant social media even earlier. Imagine the outrage when Hartnell "renewed" into Troughton!
Aww, just for shiggles, let's push online discussion tools even further into the past, say to November 30th, 1963, when the second episode aired, "The Cave of Skulls". About what the bold and the brash might have complained, I'm not sure, but I'm certain they would have felt "betrayed" by the perceived promises of "An Unearthly Child".