I just finished watching the program and I think it's well worth watching and nothing said in the program changed my mind. As Professor Mumford said, more or less, he was not perfect, he had his foibles and prejudices but in the end he did the right thing.
A few observations: I found Professors Blight, Foner, Mumford and the one from Professor balanced in their approach but did not so find with the English professor nor Bennett.
Bennett said a few things: he was a racsist, that he stood on the sidelines when the abolitionists were pushing for abolition and he wanted to deport Black Americans. Yes, his views about Blacks would be offensive today but were pretty typical for that time. No, he was not an abolitionists but abolition was not a majority position. Had Lincoln espoused abolitionism, he never would have been elected to anything. You have to remember that Springfield, Illinois, where he came of and lived his adult life, was in the southern part of the state and southern views were very prevalent there, unlike the more liberal northern part of the state. He was in favor of colonization but not forced colonization. Bennett cites his December 1862 address to Congress but a reading of that address (which by the way, as was the fashion in those days was read aloud by a clerk) does not support the proposition that his recommendation was anything but voluntary.
The one thing that I did find exaggerated was the view as Lincoln the executioner. During the Civil War, whenever a soldier was to be executed for this or that infraction, he reviewed the sentences and in many, many cases reversed the order. As far as our policy towards Native Americans, that's pretty shameful but that applies to many an administration starting with Andrew Jackson, probably up through the present time.
Foner notes that he had a capacity for growth. He did, as Frederick Douglass became a friend. If you want to see the man he became, please read the Second Inaugural Address, an amazing speech, so full of idea, but very short in length.
So, was he a saint or sinner? I don't believe in anything being all of this or that, black or white, but in shades of grey. He was not a saint but then who of our revered leaders are. However, he was definitely not a sinner.