Pros
Nice supervisor. Great parking. The building is plain, but reasonably nice. The security personnel are friendly on average. Free water at drinking fountains is a plus. Depending on your outlook, expectations are very low and you can really milk the most basic tasks as if you needed special accommodations.
Cons
Nearly everything else. DIA specializes in process for its own sake. Analytic standards are interpreted primarily through the lense stylistic convention. The mission is convoluted and this compounds the problem since it is an agency that can't decide whether it is there for policy or for direct consumption by the military. I know people who call it the Discount Intelligence Agency. Not particularly witty, but very much to the point.