First of all, I want to draw your attention to the proven fact that history is a two or more sided tale, but 90% of the time, only the victors are been recorded. Such is the case of Alexander the great where a vast majority of recorded history paints him as an ancient hero, a demigod and probably the youngest king and warrior ever to attain such powers as his.
Make no mistake, Alexander the great is undoubtedly one of the greatest minds ever to walk the earth, he was and I believe still is one of the very few humans closely associated with a God like figure. A man who at the age of 30 had already conquered the know world back then, it is only normal for people (people from places he gave protection, people from places his armies destroyed), to express different opinions and perspectives about him.
Western history will definitely say victors about Alexander given that most of the western regions during his time enjoyed his protection, paid him royalties in return for not waging wars against them and above all, he was their beloved ruler. On the hand, regions like Asia where he campaigned with much larger armies and made some of the biggest plunders of his time unfortunately falls under the other 10% sided part of history which will tell a different tale about Alexander the great.