What are strengths and weaknesses of Alexander the Great's empire?

Alexander was a complex, inscrutable man of passion and iron-will. The King possessed a keen intellect, with an ability to make quick decisions. He had supreme courage and excellent leadership skills, which contributed significantly to his greatness as a leader. also had an erratic and dangerous temper, which was almost maniacal. Alexander often succumbed to the terrible and fervent outbursts of rage and to combine this with the influence of wine which he drank heavily, could lead to the most terrible of tragedies. The extreme instance of this is the death of Cleitus the Black, who was murdered by Alexander in a drunken fit of rage