Firstly, there is some utterly disgusting comments here from other reviewers regarding the appearance of the presenter- not necessary, .
The series itself is obviously meant to be snapshots of the history around some important days, and these days just so happen to be centred around acts of war and the like, so that's important to keep in mind- very few of these events were without death and bloodshed. There are also lots of arguments that you shouldn't view these events through a modern moralistic lens- but why shouldn't we? Genocidal acts are horrible, no matter when they happened in our historical timeline, it's important to get both sides of this, especially when accounts at the time lament the death and destruction.
It's a nice change from the usual glorification of all things Rome, and I don't think it is biased as other people say, I think that it is balanced. Sure there are more details that could have been mentioned, but with the run time of each segment (~50min or so) there's only so much room there. Hopefully if anyone sees this and wants more info on any of the stories, they will seek it out.