What the Bible says about God's Evaluation of Manasseh
(From Forerunner Commentary)
It would be hard to name a king of Israel or Judah who led his nation into more evil. Yet, incredible as it is, God's Word reveals that Manasseh repented of much of it. His repentance was not a hollow one. He changed so completely that he did a complete turn-around, tearing down the idols he had erected previously and making God's commanded sacrifices at the Temple. Nowhere is he directly evaluated as doing good in God's sight, but he did some good works to clean up some of the evil mess he had created. God's evaluation of him seems to be softened considerably, considering what could have been recorded.
John W. Ritenbaugh
Leadership and Covenants (Part One)