I feel like the world is extremely non-linear but I feel like a lot of Obsidian's work went to waste as its only now happening that people are starting to play assholes and [Dumb] which is one of the two major other modes other than "Paragon Goodguy with High Persuasion." As such, the variations on the game are only now starting to be explored.
SPOILERS:
For example, almost everyone made a decision early in the game to side with a character named Adelaide and put her in charge of the city of Edgewater [Good]. However, if you side with the board [Evil] then this has horrifying consequences.
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You must kill every man, woman, and child in the city to prove your loyalty to the Board (which they won't require otherwise) because you sided with a bunch of Dissidents. Another thing is you can agree to turn over Phineas Welles the Mad Scientist to the Board, however, you can then go to meet Phineas and warn him, allowing him to set a trap.
It's also possible to kill Sophia early (who is the Final Boss) and thus change who is the Boss in the Final.
There's also a secret ending for [Dumb] characters where you kill everyone in a botched hyperspace jump.
One moment I liked is if you gun down a Companion's parents, she freaks out, demands to know why you did that and then leaves. You can also murder another Companion's girlfriend during her date with, again, special dialogue and them abandoning you. A lot changes on who you kill and when really.
END SPOILERS
As for ideologue, it depends on what you consider an "ideology"? The game says that capitalism shouldn't be put before a survival situation and scientific facts are unchanging regardless of propaganda but I'm not sure those are statements that can be argued. It's like New Vegas, "rape and pillage is wrong as is dressing like a Roman Centurion--but you can if you want, I guess."