The main attraction of this outlet of a standard "restaurant" chain (I use the term loosely) is that it is right next to the Bradbury Science Museum, and therefore convenient for the visitor to the museum. The fare is exactly what you expect for a Subway outlet, no more and no less. As my experience with Subways goes, it is somewhat below average owing to indifferent service, cramped quarters, and occasional cleanliness issues. However, it isn't just awful; a rating of 2.5 bullets ("Fair") would be more accurate if it was available. If you are unwilling or unable to walk from the museum to any of the better restaurants in downtown Los Alamos, you'll get more or less serviceable food here as long as your expectations aren't too high. But you can do better with a little effort.
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