What factors made sandy so destructive?

Hurricane Sandy was particularly destructive due to a combination of factors, including its large size, which allowed it to affect a wide area, and its timing in late October when ocean temperatures were still warm, fueling the storm. The storm's interaction with a cold front created a hybrid system that intensified its wind and rain. Additionally, Sandy's storm surge overwhelmed coastal defenses, leading to severe flooding in densely populated areas, particularly in New York and New Jersey. These factors combined to create widespread damage and significant loss of life.