Nuclear winter would have killed off everyone not directly targetted not to mention the shear volume of fallout. There would have been low grade radiation poisoning causing a shortened life-span due to an increased incidence of cancer. Not a pleasant sort of "win".
"The purpose of fighting is to win. There is no possible victory in defense. The sword is more important than the shield and skill is more important than either. The final weapon is the brain. All else is supplemental." - John Steinbeck