I don't get some of Alec Meer's comments about vanilla BE. This stood out in particular to me...
...but the president of the ARC is such a total unknown that it just feels unfair when they randomly declare war.
Now I get that for the first few games of Beyond Earth the Faction leaders are going to be ciphers--although you can infer a bit about their playstyles from their UA's--but it is never a mystery why a Faction declares war on you. In diplomatic dialogues you mouse over the name of the Faction leader in the dialogue window and see a list of positive and negative relationship modifiers. It's the exactly the same as Civ V.
You settled lands they believe are theirs.
You have a different approach to aliens and miasma (you have a different religion).
You have a different affinity (ideology).
They asked you to stop excavating near their land, you said no.
They caught you spying on them and asked you to stop, you said no.
You forgave them for spying.
You revived their civilization.
You freed some of their people.
You share a mutually beneficial trade route.
You have denounced the same leaders.
You have been to war against the same enemy.
You built wonders they coveted.
They believe you are a warmonger.
This list of relationship modifiers is found in the same spot in Beyond Earth that it is in for Civ V and the list is largely the same. plus there's always the good ol' they've simply got a larger army than you.