I saw the story on this on Dateline (? I think - all those shows run together). Both the Fusion and G6 faired poorly in the side impact test. The simple reason was not having side-impact bags standard. At the end of the story, both Ford and GM made mention of making the bags standard on '07 models.
The Hyundai did poorly in the offset crash test, due to a defect with the seats (the belt caught a latch allowing the seatback to fly forward). Hyundai issued a recall as a result, and it faired much better.
I just think that for the pricepoint, if you don't opt to buy optional side-curtain airbags, it's on you, the consumer. I'm sure if the BMW or Lexus didn't have them, they wouldn't make out so hot either.
