Every POC character is some combination of unnamed and a prop. They only seem to exist to be victims of the vampires. If it was meant to be symbolic to how whiteness tries to dominate every culture after sucking out anything that could be 'of use' it would be somewhat clever. It isn't written like that is what the intent was. Every female character also serves as little more than a prop. The end effect is like watching a very long, dry monologue. There were jokes within the tale, they just didn't hit for me and I am hard pressed to remember a single one even though I finished the story earlier today.
Other than that, in my mind, major issue the story was okay. Some scenes were enjoyable, others were not. I suspect I am just not a 'history turned fiction' reader as had these characters been wholly fiction my enjoyment of it would have been greater. 
If you like history but not enough to have read all about the events during Lincoln's life you will probably enjoy this.