Imagine the uproar if the NSI hired a graphic designer of sorts to make their slides more attractive. I can see the moaning now "They spent HOW much of my tax money making those slides pretty?!?" I expect the NSA's slide to be crappy, because you know, they're spies and stuff not graphic UX experts.
It's not about "attractive" slides, it's about slides that are to the point and don't obfuscate information (unintentionally).
Being an analyst and being able to understand the processing of data into visual display is not an orthogonal skill set. Often, PowerPoint slides are ugly and worthless because whoever designed them thought "Oh shit, I don't understand how to best convey this...time for some clip art" and/or "Faster slide animations!"
Obligatory link to Tufte's criticism of NASA and Powerpoint: http://www.edwardtufte.com/bboard/q-and-a-fetch-msg?msg_id=0...