It’s definitely the most divisive, but the idea that in any artistic or objective measure it was “the worst” is ludicrous when the prequels and 9 exist. What you’re referring to is the particular kind of “nerd problems” that aren’t a real issue with the film, but with a subsection of the audience. It’s notable that virtually everyone with your complaints and who felt they meaningfully detracted from the movie was male (to an astonishing degree - like easily 95%, when they’re only like 50% of the audience), aged 35-50 (there are exceptions, but they’re incredibly rare). I definitely wouldn’t put you in the category of toxic fans because they can’t stand the Ren-Rey stuff, and you pointed out that was well done.
The Mandalorian is nowhere near on the level of something like TLJ artistically (yet - his shows have previously gotten there, but it takes seasons and seasons), and is already having problems because it’s so obsessed with specific lore, as @BillButNotBen points out. Both seasons have had issues. The first managed to have filler despite having a tiny number of episodes, and felt like a bit of a mess, and second just wasn’t hugely compelling. The Star Wars details-nerd part of me thrilled at certain aspects of it, sure, but that is fan-service, not “good writing” or whatever. The writing was decidedly mediocre because the whole reasoning over why he had to do what he had to do wasn’t emotionally resonant (I surprised because I expected Filoni to do a better job there).
Note too that “the fanbase” in this case is a small section of the actual fanbase who are specifically men of a very certain age.
Like, my wife and I were totally blown away by TLJ. We loved it. We’re lifelong Star Wars fans, and I’m even what you might call an obsessive fan in that I know timelines and specifics and get mildly annoyed when TIE Fighters randomly have shields in certain eras where they wouldn’t and so on lol (or even more annoying, when rebel ships don’t!). But we’d both rather they told a great SW story than just got technical details precise, and TLJ did that. The real biggest flaw was that the Canto Bight plotline and associated elements, whilst very much in-line with Lucasian Star Wars (no doubt Lucas would have approved of that whole deal), didn’t really fit with the pacing of the rest of the movie.
But hey if you want a better illustration of toxic “fans” the best remains Star Trek Discovery, where people were mad because Star Trek was “woke”. Star Trek… one of the few shows that actually hits even the REAL definition of woke (esp. given the anti-capitalist, anti-nationalist, anti-imperialist, pro-decency setting), and always has done (a Russian and a black woman on the bridge of a ship representing Earth, in a post-scarcity society, in 1963, for god’s sake). And people claiming to be fans were mad because Discovery was “too woke”, like jesus fuck. How could anyone misunderstand Star Trek so badly? I could understand being mad about like clumsy Klingon stuff (which feels like a lot more than what, 4-5 years ago lol - more like ten!), but other elements, man what.