Very impressive towards the end with the ad libs. Crazy, although the accent is wrong. Nice chorus as well.
Not too impressed with the verses however. He seems to have used a Thriller era voice, but is singing in a lower tone than Thriller era Mike would sing in. Maybe if it was Vince era, the lower tone could work more. It's like he is singing using the lower tone like he does in the "can't get out of the game" in the movie The Wiz.
Most people probably won't notice this, but someone who has listened to Michael most of his life will notice straight away such "errors"