The best stories are always the simplest in my experience. Gears 1, find the mapping thingy, set up the bomb. Halo CE, find Keyes, find out why the Covenant care so much about the Halo array, stop the Flood.
Simple stories allow for effective twists, and you're never wondering about your objective. It lets you focus on the characters instead.
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In a way they are, when they are done right we see the best in more complex ones. Like Bioshock, Spec Ops The Line, Deus Ex Human Revolution, even Mass Effect.