From what I saw as a student, there are usually issues with part two because a lot of students blow it off. Students are about to match, graduate, and have usually been touring the USA on externships. A lot of times, they just don't put enough time in and count on their knowledge base. This can be a huge mistake because, unless you know the "buzz words", you could be in trouble.
It happened to a few of my friends that basically said, "I've had great rotations and learned a lot. I'll be fine." That turned out not to be the case. But, they busted their butts for a month, re-took the test and passed.
I guess the moral of the story is not to blow off part II!