The Legion is a victim of two things: cheap drama, and Hollywood Rome.
The Legion is a victim of what one of my friends call "Hollywood Rome", that is, a movie-based view of the Roman Empire as this center of power and civilization through simple tyranny and military might, looking over parts of Roman history where piety, propriety, family values, and good manners were once a part of Roman life. The writers of FNV based the Legion not on the real Rome, but on Hollywood's version of Rome, a version of Rome created by people who saw it as nothing more but a tyrant state full of slavery and militarism, a sexist state that made women little better than slaves, a version far unlike the real Rome which had complex political, familial, and sexuality issues before, during and after the Imperial period.
I mean, a big part of our perception of the ancient world is in some ways derived from the broad strokes and stereotypes the romans spread.
The egyptians are all a bunch of weird flamboyant sorcerers, greeks are just a bunch of soft spoken philosophers and big brains, the east is mysticism and secretive and the north is just full of low IQ barbarians who live in mudhuts and chuck axes. The romans wanted to be seen as simplistic militaristic farmers and soldiers, and that is sort of the image they've recieved.
I think the core issue is moreso psuedo.intellectualism, with the Legion feeling like one or more writers very specific pet-writing project. Yeah, its a hollywood styled oversimplification and interpretation of rome, but my biggest gripe is moreso the psuedo-intellectualism. oh wow, Caesar read (misread) hegelian dialectics, what a smart boy.
it just reeks of shallowness. "these barbarians are lead by a really smart person. arent we creative". Cue Caesar being about as bright as a lump of coal and his legion relying on plot-armor and these flaws are even more apparent.
And of course, cheap drama. The reason why the NCR is struggling and why the Legion is winning is because they want drama for the players who want to play a "good" playthrough. Nothing creates drama than by having the bad guys be 1 second away from winning. And yes, the Legion are meant to be the bad guys, you even get good karma for killing their guys in the final battle; that's how blatant Obsidian was as to which side was good or bad. One party member speaks up in their defense, whereas more than one party member will quit if you fight for the Legion. They crucify people, enslave innocents, and they treat women like shit, institutionalizing rape as a tool of the state. They have the Legion do all these nasty things, and they're winning. Any other player for any other faction aside from the Legion will see that as bad news, although outside of the NCR, House and Yes Man won't really have a problem kicking the Legion's face in with Securitrons.
True. it sort of feels as if they started with "Legion is bad, NCR is good", and then tried to backtrack by making the NCR a gaggle of incompetent fucknuts and the Legion be implausibly powerful, led by a man who was written by people who dont know how to write fake-intelligient characters.
its another example in fiction of people trying to slap-hazardly add nuance by being like "what if good guy do bad and bad guy do good". The Legion lowkey reminds me of the way the Wildlings were written in GOT (havent read the books) where the author tries to inject nuance but fails, only making both sides look dumber.
That's because fixing those flaws would make said faction flawless. And these writers very well can't have that. You can't have the NCR decide to lower taxes, or make Caesar see the light on women being free citizens. Just as you can't get Ulfric to see the light in helping non-Nords, or having the Empire make an exception to the White-Gold Concordat for Skyrim. If that was the case, people won't see the point of fighting on. While that's how real-world conflicts end (one side wins, makes concessions to the other side, and they sign a truce) that's not how fictional conflicts end, where usually, one side wins decisively, and the other is annihilated, or it walks away to lick its wounds and dream of revenge.
Of course, and as someone who writes frequently myself i find myself in the unenviable position of trying to write realistic conflicts that aren't just "Me want your land".
the problem with poor psuedo-intellectual writing is that it only seeks to sate bare minimal intellectual bases.
"no conflict is completely black and white, therefore both sides must have good and bad and be neutral", even when its clear that one faction is significantly worse than the other, structurally or otherwise.
Caesar dies, and the entire legion will collapse into a thousand civil wars between different charismatic generals, and since there is no senate the only hope for wrangling the legion back together is legate lanius, and that will only be after a lengthy civil war.
Kimball dies, and he is replaced by his VP and things go back to business.
yet this vast discrepency in structural integrity of each nation is never really brought up or even considered. Caesar does seem to have some understanding that his legion is somewhat brittle, but its just lampshaded, like most major concerns.
Same with the Empire in TES. IT doesnt matter how racist or stupid or whatever the stormcloaks are, because the Empire literally sold out their god, and gave their arch enemies carte blanche to spy, sabotage, murder, maim, kidnap and destroy to their hearts content with no oversight. Skyrim is one of the hardest provinces to attack, and the Thalmor were legit given several heavily fortified and strategic forts in the province.
doesnt matter how much people talk about "strength in numbers" and "we must stay united" when the Empire makes the very premise of unity impossible.
I'd say that what the player did for the NCR is a more exhaustive list of what the player did for the Legion; that still doesn't change the fact that the NCR is inefficient as fuck, run by corrupt politicians, overtaxing people to the point where they'd prefer an independent Vegas over the NCR. Just as helping the Legion won't change their ways, only Caesar can do that at the end. It's just that there's more to do for the NCR because they're a bunch of ineffective fuck-ups, as opposed to the Legion where they actually have effective leaders that have everything in place, and they just need someone to get a few things done for them before they begin their assault. The Legion has less reason to change, at least from their perspective, because in the last five years after losing the first battle for Hoover Dam, they've done nothing but win one small victory after another, to the point where the NCR forces are depressed as fuck and are basically just expecting death at that point.
At least it felt like i was actually doing something with the NCR, and it did have noticeable changes. not much, but at least a little. actually helping NCR citizens and training NCR soldiers.
And again, the NCR has realistic weaknesses, the Legion has next to not weaknesses because they're just fucking perfect, cept for the evil stuff but they're just evil out of nessecity, trust me bro.
Everyone talks about "NCR and their high taxes", but we never really get to know how high, if high at all, those taxes are.
The legion also has taxes, but no one talks about Legion taxes because legion politics, unlike NCR politics, is never once brought up. from the descriptions of it you'd halfway expect core Legion territory to just be a replica of rome. Hilly green country-sides with aquaducts and parthenons.
The Legion really is the Edgy angsty anime protagonist of factions. unbeatable, perfect, and whenever he is evil its because he had to.