I hate to break it to you, but newspapers back then made zero effort at being impartial observers. The Democrat papers were going to damn the Lincoln administration regardless of what they did. Kind of like PMSNBC does with Trump today .
As to Charles Dickens “Notes on America” saying nice things, you could not be more wrong.
Charles Dickens came away from his American experience with a sense of disappointment. To his friend William Macready he wrote "this is not the republic I came to see; this is not the republic of my imagination" (Letters, 1974, v. 3, p. 156). On returning to England Dickens began an account of his American trip which he completed in four months. Not only did Dickens attack slavery in American Notes, he also attacked the American press whom he blamed for the American's lack of general information. In Dickens' next novel, Martin Chuzzlewit, he sends young Martin to America where he continues to vent his feelings for the young republic. American response to both books was extremely negative and passions flared.Source: https://www.charlesdickenspage.com/charles-dickens-in-america.html
That seems fair to me.
I already told you he was an abolitionist who hated slavery.