What are some games where, for the most part you're selecting

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What are some games where, for the most part you're selecting and working for a faction?

I always find myself most immersed in a game when just doing tasks for a faction rather than pursuing some main quest about destroying an ancient evil or whatnot.

Way of the Samurai does it well where what faction you decide to join (if any) shows you a different perspective of events that occur in the area they're vying for control over.

STALKER does it well by giving interesting perspectives on the things that the different factions are fighting over.

Morrowind did it well by just having a fuckload of factions with a variety of focuses.

Are there any other games where the primary focus is on what faction you join and what you can do for them?