Mediocre.
Characters
The way the characters interact is kind of cringey. A lot of the dialogue is just bad. They just don't feel real. E.g. There was one scene in which Isaac just randomly zones out and it flashes back to his past then goes back to talking. It was out of nowhere.
Action
Most of the action is animated well. However, there is a lot of it and some of it is just mindless killing. It just feels like needless violence.
Story
Pretty good story. You really sympathize with the villain. Also, the beginning of the show sets the stage nicely for the first arc.