Uneven, wonky by design, and a bit of a stretch, even by sci-fi standards. But, along with Moon, it very much works in the spirit of a 1960s sci-fi short story, and for that, I'm glad we have Duncan Jones.
Groundhog Day meets The Matrix meets Inception. Derivative, yes, but the War on Terror spin gives it all a unique flavor. To what extent are we really willing to fight terrorists? Is victory really worth it for all of us in the "reality-based community"? Of note: in the real world, everything had a green tinge, and in the source code dream world, everything had a blue tinge. That is the exact opposite of The Matrix.