Despite Star Trek: Discovery’s critical success, it was far from a fan-favorite. Though all four seasons boast an average 85 percent critical score, the audience score is at a dismal 37 percent. Since audience scores are more strongly correlated to overall viewership, Discovery simply wasn’t pulling the numbers to make it a financially viable intellectual property.
I don’t think the ‘audience’ ratings can be fully trusted though. Any new film or TV show these days with prominent women, minority or LGBTQ characters (Discovery has all) gets routinely review-bombed by alt-right participants who likely haven’t even watched it - that’s just a fact of these ratings. My anecdotal discussions with irl Trek fans didn’t find the same antagonism to Discovery that you find online.
Discovery wasn’t the best of Star Trek, and I ended up switching off early Season 4, but much of the early hostility towards it was either that sort of bad faith, or focused on trivia (which leads me to wonder if it was just cover for the same - I cannot get my head around people who refused to watch because they didn’t like the Klingon prosthetics).
Season 1 was solid, Season 2 was arguably even better (although owed a lot off that to Captain Pike). Season 3 had great promise in its premise but failed to realise it’s potential, and then Season 4 just felt lost.
It wasn’t just the prosthetics that were awful, Klingon culture was completely different too. Why even call them Klingons?
The shame is that the ending of Season 4 might be one of the most ’ Star Trek’ moments in the franchise. But the lead up to was so generic that many didn’t make it that far.