And ye have done worse than your fathers - The sins of the fathers would not have been visited on the children, had they not followed their example, and become even worse than they.
Albert Barnes
Notes on the Whole Bible
Imaginations - Read stubbornness.
Matthew Henry
Concise Bible Commentary
Here seems to be the language of those who quarrel at the word of God, and instead of humbling and condemning themselves, justify themselves, as though God did them wrong. A plain and full answer is given. They were more obstinate in sin than their fathers, walking every one after the devices of his heart. Since they will not hearken, they shall be hurried away into a far country, a land they know not. If they had God's favour, that would make even the land of their captivity pleasant.