Counterargument (which I think I might've made before? Or someone's made before, it's been a long fucking thread...): There is a marked tendency within SW fandom in particular but also the larger set of science fiction/fantasy fandom in general to glorify and fetishize the trappings of fascism. The snappy uniforms, the striking emblems, the legions of imposing-looking soldiers all marching in lockstep, all of that stuff is meant to reinforce that the legion of doom is powerful and inevitable. It's very easy to get swept up in the pageantry of fascism and think "maybe I don't agree with these guys 100% but clearly they're doing something right" -- which is exactly the point. They want people to think of them as mighty, because that's part of how they draw recruits and also how they cow dissent.
The truth of course is considerably different. The classical fascists were buffoons. Murderous buffoons who rampaged across Europe before finally being put down, yes, but the depths of their cruelty and atrocities doesn't obscure the fact that most of them didn't exactly have their shit together. Their cosplaying grandchildren are even worse in the having-their-shit-together department, thank fuck. Most of these people would have difficulty organizing a pissup in a brewery, and the main reason they get as far as they do is because of complacency or outside forces thinking they're useful idiots.
What does this have to do with the NT, and TLJ in particular? Well, I think that the greatest strength -- and at least where some of this massive fanCHUD ire originates -- of the NT is that it strips that fascist mystique away from the First Order. None of these people come off as cool or calculating, they're a collection of opportunists, barely-competent world burners and people for whom world-burning is a shade too rational. We look beneath the crimson banners and shiny uniforms and see a bunch of children throwing a tantrum with live weapons. Even as they break the Republic and whittle down the Resistance we see the true nature of the First Order and instead of being attracted to the powerful we're repulsed by how petty they are. The NT teaches us that things like the Empire and the First Order may be worthy of our caution, they are in no ways worthy of our respect. And that I think drives a certain class of fan absolutely fucking nuts.
But that's their problem.