Apart from Mass Effect, Pillars of Eternity, and Deus Ex as others have already mentioned, I’d like to also add:
Grim Dawn.
The conflicts in its Universe feels reasonable, all the factions have their history and reasons of existence, there are beneficial and selfish, but no clear black and white, and everything interacts. The Lore is very good for an ARPG that focuses on combat, loots and built.