Well, that didn't really help. He pretty much entirely avoids the subject of slavery, the cause of the War comes down to Walter Huston repeatedly glancing skyward and in a stentorian tone announcing that "The Union must be preserved!"
Visually, it's obviously an early sound film. The sound quality was really terrible and the camera hardly ever moves (early sound cameras were to big to float around in the ways they did in the late silent era). Griffith manages to condense Lincoln's entire life to an hour and a half, mainly by structuring the film as a collection of short scenes connected by fades. Lincoln rarely has anything more to say on an issue than a sound bite or a short folksy anecdote. Lincoln's most famous speeches are elided together or eliminated altogether: the "House Divided" line is inserted into the Lincoln-Douglas debates (which consist of, IIRC, 6 total lines), "Malice toward none and charity toward all" from the second inaugural is moved to some remarks before Our American Cousin starts (along with the final lines of the Gettysburg address). The War is nothing but crushing defeats, until suddenly the North wins.
It's better than BOAN in that its not actively evil, and there are some very nice framings. But Griffith's silent work was all movement and kineticism, both in camera and in editing. This film just kind of sits there.