No. Even the ending with Caesar living has him enslaving most of the population and there is no mention of this being due to resistance. Potential Arcade endings mention refugees being hunted down and slaughtered regardless of who you put in charge. Fleeing is resistance? Put Lanius in charge and it's even worse.
What? There's mention of resistance all over the place.
Spoiler
The Followers: After the Legion's victory, Caesar, out of a strange respect for his old fellows, allowed the Followers safe passage out of the wasteland. Reluctantly, the Followers accepted the offer and abandoned Old Mormon Fort to the Legion.
Novac: Though Novac was a low-priority target for the Legion, many of Novac's citizens died in its defense. With no other communities coming to its defense, Novac would eventually fall to the Legion's persistent attacks.
Freeside (Kings): After their victory at Hoover Dam, Legion troops rolled through Freeside. The Kings tried to fight back, but most were killed, and the rest fled into the wasteland.
Primm (NCR becoming 'Sheriff): Despite NCR's pledge to support Primm, they abandon the town after their loss to Caesar. Though Caesar keeps Primm open for business, its citizens live under the constant watch of Legion soldiers.
Primm (Meyers): Hot-headed to the end, Sheriff Meyers choose to oppose Caesar's takeover of Primm with a standoff. Though the citizens take out a few Legionaries, the town quickly falls to Caesar, its citizens utterly wiped out.
Legion Ending:Caesar entered The Strip as though it was his Triumph. The Legion pushed the NCR out of New Vegas entirely, driving them back to the Mojave Outpost. The Legion occupied all major locations, enslaving much of the population and peacefully lording over the rest. Under the Legion's banner, civilization - unforgiving as it was - finally came to the Mojave wasteland.
Possibly because he doesn't have to deal with a massive militant force hellbent on destroying him draining all his resources on the other side of the Colorado? The NCR gets it's gang problems under control if you help them drive off the Legion.
Spoiler
Fiends: Never weakened by NCR, the Fiends staged an attack against Camp McCarran during the second Battle of Hoover Dam. Though NCR repulsed the Fiends, they suffered heavy losses in the process. Yes, they where destroyed but with heavy losses.
Fiends (Legion): The Fiends attacked Camp McCarran during the second Battle of Hoover Dam and suffered heavy losses. Caesar, unimpressed with their performance and their dependence on chems, had them exterminated.
Vault 19 Powder Gangers: Armed with a wide array of improvised explosives and stolen weapons, the Vault 19 Powder Gang tormented the Mojave Wasteland for years. Citizens of the NCR were favorite targets, and they always suffered the worst fates.
Powder Gangers: Most Powder Gangers at the Correctional Facility fled into the wasteland rather than face the advancing forces of the Legion. Those brave or foolish to remain were killed or crucified by the merciless Legionaries.
Presence of democracy and individual rights, however corrupt and debased they may be at times. Absence of state religion. Absence of slavery. Far less misogyny. Recognition of the laws of war as opposed to brutal savagery. No brainwashing of children. Absence of cruel and unusual punishments. Recognition of the value of advanced medicine. Recognition of the value of advanced technology in general.
This can go on for a while.
Individual Rights? Most people in the NCR have no say as to what goes on, the large land owners and Barhmin Barons do.
Ha! 'Laws of War'?! Don't be naive.
Absence of State Religion would be more of a weakness, would make them less unified.
Brainwashing of Children isn't bad nor good, it helps the Legion in the end.
Absence of curel and unsual punishment? The NCR either kills it's prisoners or sends them away to do hard labor, under poor conditions. Says it in one of the loading screens.