Surprisingly Good
I just watched it on Netflix having avoided it for so long based on all of the negative comments I've seen about the movie and I have to say I really enjoyed it.
The hate seems to come from three different camps. The first thinks the premise is too absurd, I guess they've never seen a movie before and or viewed this as some type of documentary. The second seem to base the hate purely on Josh Peck. I looked him up, apparently he was in a Nick show, which I'd never heard of. In fact, I'd never heard of him, which I guess was better since I had no bias going in. The third group seem to just dislike the movie because it is too pro-America. I guess they'd rather see the movie from Korea's standpoint.
All in all I liked it.