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@Orphalesion, in most cases I can't point to a specific moment. I bailed on ENT somewhere (I think) in Season 2, because of the cumulative weight of gratuitous BS like the decontamination gel plus the endless continuity violations that loved to steal away "firsts" from TOS. I got sick of them retconning first encounters with various alien species to have now been done by the NX-01, and sometimes they didn't even bother coming up with a lame excuse for why Kirk and Spock don't know about any of Archer's first contacts. The show felt like it was exploiting the franchise more than expanding it. Super disappointing, because I like Bakula and I thought the time period was ripe with possibilities. Though I think I remember enjoying Carbon Creek. Anyway, my wife continued watching, generally liked it, and told me it got better. I believed her and still do. Yet I never went back, especially after I learned what an abomination the series ending was.
I never made it past the first 20 or 30 minutes of DISCO and SNW. There was so much cringe in both opening episodes, I could tell it was going to be endless frustration for me. If I were to pick out a couple of specific examples, I guess for DISCO it was the incomprehensibly bad transformation of the Klingons plus the idiotic, mic-dropping gimmick of the two leads getting themselves rescued by tramping out the shape of a Starfleet emblem in the sand. Things like these said a lot about what the new writing team believed makes good Star Trek.
For SNW, my first memory was the chaotically unprofessional attitudes of the junior officers toward their superiors. Ever since then, little clips I've seen here and there from episode trailers, or fans trying to show cool highlights, have only reinforced things for me. These are just shows whose writers don't find importance in the things that matter to me. It feels like they are trying so hard to impress with imaginative ideas and little gimmick scenes that they have no time to make a show about franchise continuity and believable characters who've made it through their military training to become the best of the best and work together as a team, in a universe I would like to live in and on a ship whose crew I would like to be a member of. Instead we have to cry and scream and scold each other and dance with the Klingons and crawl around on the floor while turning into Vulcans and ... whatever other gimmicky nonsense I fortunately don't know about. It's like wanting to go to a nice restaurant with ballroom dancing and finding yourself stumbling into an orgy of furries. I get that the kids in the animal costumes are having fun, but that's not what I was looking for.
Section 31, I gave up on after seeing the trailer. It was obvious it was going to be garbage.
On the other hand, I generally like the Jar-Jar Abrams movies (and my wife does too). I never had a retcon issue with those because I immediately understood and accepted that the time travel made this a completely different timeline. There are missteps, for sure, but I was able to accept it as Star Trek, whereas Kurtzman TV all feels like something else that has just licensed the brand. Basically it's the TV equivalent of companies like Remco slapping Trek stickers on their battle tanks and dork helmets. (Although I am just about ready to dive into Lower Decks, which I understand will be a much more positive experience once I can get over the annoying hyperactivity of the first few episodes.)