This anime, like the others have commented, have good animation, and some pleasant fight scenes.
However, I couldn't bring myself to care about many of the characters. Surprisingly enough, I found MIkoto, Yata, Fushumi, and Neko as the most interesting character.
Second, the OST isn't that good. Especially for certain scenes that were meant to be serious, I couldn't treat them as such because the OST playing in the background just didn't fit it.
The story isn't that great. Things are explained way too late for my taste. I found myself skipping some scenes because it just wasn't worth it.
And last, but not the least, the fan service is freaking annoying. It is literally just thrust in your face. Seri, a right-hand woman of one of the kings, was just there for fan service. She was honestly the biggest disappointment to me in the anime.