The Bible teaches that God declares Himself to be good and just.
In order to state if God's dealings with Moses and the Israel are positive/negative, just/unjust right/wrong, first you must define those terms and decide what standard you are going to use for measuring them.
For the first element, I will use the 2002 American Heritage Dictionary definition of positive (an affirmative element) and negative (unpleasant, disagreeable). Based on those ...
What Bible verses state that God is just? Are God's dealings with Moses and the Israel are positive/negative, just/unjust right/wrong?