John Gill Commentary 2 Kings 18:3

"And he did that which was right in the eyes of Jehovah, according to all that David his father had done." — 2 Kings 18:3 (ASV)

And he did that which was right in the sight of the Lord,
according to all that David his father did .
] Some of the kings of Judah, that were better than some others, are said to do that which was right, but not like David; or they did as he did, but not according to all that he did, as is here said of Hezekiah.