Alexander's empire died with him. His generals divided up his holdings among themselves and warred on each other. Within a few years, the only real change caused by him was found in Egypt. His inability to hold onto what he conquered long-term makes him strategically unremarkable.
That is the reason why I consider Cyrus the Great as the greatest military commander of all time.
Born as iranian persian prince he conquered the dominating iranian MedianEmpire. Next he conquered the Lydian Empire and the Babylonian Empire.
The most important thing during his 3 decades of rule was his clever politic of using tolerance - something unknown before him.
While (for example) the Assyrians massacred and enslaved those who lost against them and later became massacred by the victorious triple-alliance of the Medes, Egyptians and Babylonians themself, Cyrus treated his opponents after his victories in another way: He allowed them to keep social and religious structure. Even their nobility - so the title Shahanshah (= King of the Kings) could bee seen literally.
So within 30 years of his reign Cyrus the Great created the iranian Achaemenid Empire which reached from the Mediterranean Sea and Hellespont in the west to the Indus River in the east.
His son, Cambyses II, conquered Egypt, Nubia, and Cyrenaica.
Maybe Alexander would become the same brilliant leader if he had not died so soon.