If you enjoy period pieces and/or procedural dramas and you don't mind a bit of a slow burn, you'll probably enjoy this series. Tobias Menzies is excellent (and does a really good American accent), even if he doesn't have the truly glorious beard the real Edwin Stanton had. Anthony Boyle is absolutely despicable as Booth, as he should be. Every scene with Lovie Simone is so tense and beautifully acted that I can't really take my eyes off the screen when she's on it.
As other reviewers have mentioned, there are of course historical inaccuracies. Duh. Every movie or series based on historical events has inaccuracies. If that bothers you to the point of distraction, then perhaps you should stick to documentaries. As for Lincoln's voice, which a lot of reviewers seem to find downright offensive, historian and Lincoln-enthusiast Harold Holzer has said that Lincoln was almost certainly a tenor based on contemporary accounts. Some who heard Abe speak even described his voice as high and shrill. It may be a bit jarring the first time you hear it, but Linklater's voice at least is consistent with contemporary descriptions of Lincoln's.
I also just genuinely don't know what the complaint about casting is. So what if some of these actors are better known for comic roles? They're definitely not playing their roles comically here. I don't find anyone particularly miscast.
This show is fine. It's not going to go down in the books as the greatest series ever, or even one of my favorites. But holy canoli, it's so much better than the majority of reviews are giving it credit for.
