DC doesn't have a main stadium where the national team plays like other capitols (Wembley in London, Stade de France in Paris, Azteca*, etc), and the MNT doesn't have an main stadium in another city (the Maracanã in Rio). As
@Purp noted, it's actually a good venue for international soccer. So I'm OK with the final at The Stadjium.
Looking at it from a purely sporting perspective, and maybe I'm biased because of undimmed glory of 1/1/2011, IMHO the Final should be played at The Rose Bowl. It's the most iconic sporting venue we have in the States, and there would be a nice symmetry of the 1994 and 2026 Finals at the same venue. Heck, I'd be perfectly fine if the CFP put the MNC title game there every year. But it doesn't have what FIFA wants these days: loads of luxury suites and the ability to cram in over 100k (which Jerrah will bring in as many erector set bleachers as he can) to maximize the bag.
Plus, if Berhalter gets a brain transplant and the MNT by some miracle make it to the Final, I will be able to attend.
*insert obligatory "get scheissed, LLLa tri."