I completed the game a little while ago. I thought the end game segment was disappointing. The Monster Army and the Hundred Families played no part in it for me, despite being loved by both. Even the Marshals play only a minor role. Also nothing with the Gippers or Machine Commune.
I was expecting a good amount of reactivity towards my actions with the various factions and major NPCs but instead the finale of the game is very straightforward: support the Patriarch or Angela Deth. I can't see why anyone would support Angela -- the game makes it very clear that doing so will fuck over Arizona, and she comes across as a retarded hypocrite. Her entire reason for wanting to rebel is because she thinks it's wrong for the Rangers to support someone like the Patriarch... yet she wants to help Cordite, a slaver who plans to rally gangs to dominate Kansas, and gets pissy if you kill the guy.
The game in general seems like it just sorta sputters out. The plot feels like it's building up to something with you hunting down the Patriarch's kids and that once you finish that task something's going to happen... but, no, that's just about 99% of the game's story. The game makes a big deal about succession, the Patriarch's failing health, all the tenuous loyalties held together by the Patriarch, and even has some stuff about elections being held, so I was hoping that once you dealt with Valor, Victory, and Liberty that something would happen to the Patriarch, forcing you to dealt with the aftermath and chaos, and then decide who'll lead Colorado. Nope.
Even the ending slides are kinda disappointing, with them being simple and short, not really expanding on much.