Yeah, I hear they've changed the bad guys from Chicoms to North Koreans because they didn't want to piss off the people with the money, and everybody's all butthurt and saying that it's completely unrealistic to show the Norks invading the continental US.
Guess what? It's hardly less realistic than a Soviet Il-76 dropping paratroopers over central Colorado in 1984. Seriously.
It's a fantasy. Enjoy the fantasy.