This is a common misconception associated with older metal sheds and barn roofing. No, metal roofs will not attract lightning. Lightning is typically attracted to the highest point in an area, not exclusively metal objects. If lighting should strike a metal roof it may be safer than traditional roofing products, since a metal roof will help conduct and dissipate the electrical charge of lightning. Also, a metal roof is non-combustible so it will not burn if struck by lightning.
Metal roofs are very strong and durable.
In most cases, metal roofing is not damaged by hail. It will not crack, split or break when struck by hail, as would other roofing materials.