Whoop-de-doo. Take a look at the complaints against ANY popular car. By and large they are simply ridiculous. As I recal, the NHTSA has many complaints against third generation Honda Accord for, as one complainee put it, "car accelerated into building while transmission was in park and parking brake applied". This type of claim is a cover for "I hit the gas instead of the brake and I am lying about both the parking brake and the transmission being in park". In any car with a functioning parking brake, the car is essentially immovable with the brake properly applied. But I digress.
More to the point, anyone who lets a bearing get bad enough that the wheel would fall off is a raging moron. Anyone who has ever driven a vehicle with a bad bearing know that they whine like banshees long before anything serious happens. Considering that the car is completely new I think that Ford has done an exceptional job in keeping problems down, though I certainly agree that there should be some sort of recall if manufacturing defects are found.
ZV
EDIT: <<"its great other than the rear wheel sometimes falls off!">>
Read the article. What part of "may cause" don't you understand? There have not been actual cases of the wheels falling off, they are simply noting that it is among the possible consequences of wheel bearing failure. Sheesh.