Huh, the Shangri La missions are kind of novel, but at the same time, they're jarringly displaced from, well, anything. You don't even get the explanation (such as it was) of being on hallucinogenics from Far Cry 3 for how Ajay's suddenly in the past living out this other guys memory. The sudden emphasis on melee combat (because as nice as the time slowing bow is, it doesn't show up til the second one, and against larger zones will not keep the demons at bay) really sticks out how shoddily simplistic the melee is. To say nothing of the major difficulty spike being from groups of fire spamming enemies who have to be taken out one by one via combo with the Tiger (who often gets set on fire and stops attacking).
The binary choice is silly, its advertised in its introduction as a "completely different set of missions until the next choice", but its the same missions with one or two alternate objectives. You still go and stop them blowing up the mentioned statues, but one has you light torches after, while the other blows up a rock. Even most of the cutscene dialogue is unchanged, though delivered in angry voice by whoever you irritated.
Pagan's oppression is pretty heavily covered across sidequests, and the propaganda radio broadcasts, and in his phone calls. I'm not sure how you'd be unclear on it.
Reggie and Yogi are irritating, and you're not really given a reason why you'd keep associating with them.