As for me, Far Cry 4 and all subsequent ones are just CTRL + C and CTRL + V of the third part. The plot is the same, just different faces. Arrived, arrived somewhere, grabbed, ran away. You collect herbs, animal skins. Fight for freedom. Won. End.
After Vaas in part 3, they tried to make the same charismatic boss, Pagan is good, really good, but not so much.
Yes, there is a part 4. But I passed with a feeling of deja vu, that somewhere I had already seen it.