There are a bunch of movies that are bad except that John Candy is in them.
This is one. The movie is mostly dull—lots of unfunny lines played as if they were funny—except for Candy playing a proto-Del Griffith. His scenes singlehandedly make the movie worth considering watching, particularly his ridiculously hilarious (and hilariously ridiculous) brainwashing by the Communists.
Pity that Candy disappears from vast portions of the picture, which is instead taken up by Tom Hanks failing to be funny while apparently gargling with marbles in a bizarre attempt to sound like George Plimpton.