How bad is it? Dated propaganda with heavy use of stock footage.
Should you see it? No.
This is more like "Rocket Attack USA" than the Chuck Norris film "Invasion USA." Various stock characters in a New York City bar discuss stopping communism; then the news says Alaska's been invaded. And three atomic bombs have been dropped on the U.S. There's a ton of stock footage, much of it military in origin. The film tries to hammer the message to boost the military to fight the commies, but the characters are uninteresting, the story uninvolving and the overall cheapness is obvious.