Lincoln's plan for bringing the Confederacy back into the Union did not include suffrage for the "black" slaves. There has been controversy over this, but he also did nothing about the enslaved Native Americans. It is most commonly believe though, about the "black" suffrage not being included in the plan was because it would have created a lot of tension in the South.
I know there are other things, but I'm drawing a blank sorry. The way i see it, he was better than many in the circumstances he was in.