Doctor Who: Peter capaldi in general, the episode Day of the Moon in particular. Not only was the writing shit, peter's take on the character terrible, and the stories fucking insipid and shallow as humanly possible, but worst of all critics slavishly refused to offer even the slightest criticism of anything, giving almost every episode 9/10 or 10/10 seemingly for fear of alienating themselves from being friends with the cast and crew IRL, meaning the writers never had even vague incentive to get shit together and stop sucking even as ratings tanked to levels that made the show in danger of cancellation.
Which ties into our next entry
Star Wars: The Last Jedi just fucking killed the franchise. Any potential the original trilogy, or even The Force Awakens was gleefully squandered just for "WAT A TWEEEST!" shit that would make M Night Shyamlan wince, the characterisation of EVERYONE was butchered with Rey's mary sue shtick turned up to 11, finn turned to bumbling comic relief, poe into an idiot, and luke skywalker into a miserable half failed comic relief hobo. And rose is literally a shorter, uglier Jar Jar Binks but without the ability to entertain small children.
Worst of all this film has fucking poisoned almost any way for the setting to truly expand since the original characters are all dead and original concepts have been largely discarded, leaving any advancement on the shoulders of badly written and obnoxious replacement characters. And much like Doctor Who, the critics all fawned over it for much the same reasons, either out of fear of pissing disney off, a desperation to fit in with the kewl kid kritics, or just due to a dumbass culture war they seem obsessed with waging because "MUH DIVERSITY!" means they can write clickbait pieces on how this is the first film with asians and blacks or how all white nurds are boycotting it because they hate niggos or some shit.
Speaking of which...
Star Trek: discovery didnt do it. the interviews the main actress did in which she bragged about how she was the first female protagonist AND first black protagonist in the series' history.
I was only ever a casual star trek fan, but even I fucking know about goddamn Sisko and Janeway, so frankly I feel no reason to waste my time on a star trek series with this dumbass as the main character.
also "spock's sekrit adopted sister" is such a fucking bad-fanfiction cliche it almost sounds like a parody.